Can we see a point with only one ray or do we need two rays?Is it possible to make a source of light such that it only emits one ray of light?Focal Point vs where you see the imagesConvergence of Light on the RetinaSeeing the image as explained by Geometrical optics?The physics behind Google Glass' “prism”Is the image formed at the retina messy?Why magnetic component of light is not shown in polarization diagram? Does polarization eliminate magnetic field?For the derivation of the form of a paraboloidal reflector, there is much more in need as just Fermats principle?Why can we only “see” reflected light?Tiny blue and red paint close to each other result in black or magenta?A Question About Thin Film Interference

Should I take out a loan for a friend to invest on my behalf?

Are babies of evil humanoid species inherently evil?

Should I tell my boss the work he did was worthless

Unreachable code, but reachable with exception

BitNot does not flip bits in the way I expected

How did Alan Turing break the enigma code using the hint given by the lady in the bar?

Rejected in 4th interview round citing insufficient years of experience

Latest web browser compatible with Windows 98

Why doesn't this Google Translate ad use the word "Translation" instead of "Translate"?

Accountant/ lawyer will not return my call

What wound would be of little consequence to a biped but terrible for a quadruped?

Why does Deadpool say "You're welcome, Canada," after shooting Ryan Reynolds in the end credits?

Force user to remove USB token

PTIJ: Why can't I eat anything?

Grey hair or white hair

Good allowance savings plan?

Why does Captain Marvel assume the planet where she lands would recognize her credentials?

Does "variables should live in the smallest scope as possible" include the case "variables should not exist if possible"?

Finding algorithms of QGIS commands?

What to do when during a meeting client people start to fight (even physically) with each others?

Do Bugbears' arms literally get longer when it's their turn?

In the late 1940’s to early 1950’s what technology was available that could melt a LOT of ice?

What are some noteworthy "mic-drop" moments in math?

A three room house but a three headED dog



Can we see a point with only one ray or do we need two rays?


Is it possible to make a source of light such that it only emits one ray of light?Focal Point vs where you see the imagesConvergence of Light on the RetinaSeeing the image as explained by Geometrical optics?The physics behind Google Glass' “prism”Is the image formed at the retina messy?Why magnetic component of light is not shown in polarization diagram? Does polarization eliminate magnetic field?For the derivation of the form of a paraboloidal reflector, there is much more in need as just Fermats principle?Why can we only “see” reflected light?Tiny blue and red paint close to each other result in black or magenta?A Question About Thin Film Interference













6












$begingroup$


I am just a high school student trying to self study, so please excuse me if you find the question silly.



My teacher says that we can see a point when a ray of light from the point is reflected into our eye.



But almost everyone on the internet say that when two diverging rays from a point enter our eye we can see the point.



Which one is correct A or B.
(Don't laugh I only had paint)



enter image description here










share|cite|improve this question











$endgroup$







  • 3




    $begingroup$
    Related Is it possible to make a source of light such that it only emits one ray of light?
    $endgroup$
    – Farcher
    2 days ago











  • $begingroup$
    @Farcher That is also my question.
    $endgroup$
    – Aditya Bharadwaj
    2 days ago















6












$begingroup$


I am just a high school student trying to self study, so please excuse me if you find the question silly.



My teacher says that we can see a point when a ray of light from the point is reflected into our eye.



But almost everyone on the internet say that when two diverging rays from a point enter our eye we can see the point.



Which one is correct A or B.
(Don't laugh I only had paint)



enter image description here










share|cite|improve this question











$endgroup$







  • 3




    $begingroup$
    Related Is it possible to make a source of light such that it only emits one ray of light?
    $endgroup$
    – Farcher
    2 days ago











  • $begingroup$
    @Farcher That is also my question.
    $endgroup$
    – Aditya Bharadwaj
    2 days ago













6












6








6





$begingroup$


I am just a high school student trying to self study, so please excuse me if you find the question silly.



My teacher says that we can see a point when a ray of light from the point is reflected into our eye.



But almost everyone on the internet say that when two diverging rays from a point enter our eye we can see the point.



Which one is correct A or B.
(Don't laugh I only had paint)



enter image description here










share|cite|improve this question











$endgroup$




I am just a high school student trying to self study, so please excuse me if you find the question silly.



My teacher says that we can see a point when a ray of light from the point is reflected into our eye.



But almost everyone on the internet say that when two diverging rays from a point enter our eye we can see the point.



Which one is correct A or B.
(Don't laugh I only had paint)



enter image description here







optics visible-light lenses vision






share|cite|improve this question















share|cite|improve this question













share|cite|improve this question




share|cite|improve this question








edited 2 days ago









IamAStudent

1,061216




1,061216










asked 2 days ago









Aditya BharadwajAditya Bharadwaj

3471112




3471112







  • 3




    $begingroup$
    Related Is it possible to make a source of light such that it only emits one ray of light?
    $endgroup$
    – Farcher
    2 days ago











  • $begingroup$
    @Farcher That is also my question.
    $endgroup$
    – Aditya Bharadwaj
    2 days ago












  • 3




    $begingroup$
    Related Is it possible to make a source of light such that it only emits one ray of light?
    $endgroup$
    – Farcher
    2 days ago











  • $begingroup$
    @Farcher That is also my question.
    $endgroup$
    – Aditya Bharadwaj
    2 days ago







3




3




$begingroup$
Related Is it possible to make a source of light such that it only emits one ray of light?
$endgroup$
– Farcher
2 days ago





$begingroup$
Related Is it possible to make a source of light such that it only emits one ray of light?
$endgroup$
– Farcher
2 days ago













$begingroup$
@Farcher That is also my question.
$endgroup$
– Aditya Bharadwaj
2 days ago




$begingroup$
@Farcher That is also my question.
$endgroup$
– Aditya Bharadwaj
2 days ago










2 Answers
2






active

oldest

votes


















4












$begingroup$

Both are correct in ways.



The eye changes its shape so that when you focus on a point, all the diverging light from that point is collected and redirected onto (roughly) the same detector on the back of your eye. (as in image B) However, in theory, you only need to collect a single photon to "see" a point (this corresponds more closely to A). Very sensitive light detectors can see a single particle of light, and IIRC, so can the eye if it is very dark.



In reality however, most objects emit light in all directions, so in realistic situations, B is the better picture. It's important to note that there are "an infinity" (in reality a large but finite number) of rays emitted in a cone from every point. There is nothing special about the ray distinguished in A. If you blocked the top ray in B, you'd still see the point, it would be the same situation as A, but the light would just be bent by the eye. Each additional ray simply adds to the amount of light collected by the eye, making the image more clear.






share|cite|improve this answer









$endgroup$












  • $begingroup$
    Just to make sure I understood it correctly. You are saying that one ray of light would not give our brain sufficient information to form a clear image, but a ray of light is the minimum amount of light needed to sense something although not very clearly. If two or more rays enter our eyes then we can recover more information about the object and we will be able to see a clearer image.Right?
    $endgroup$
    – Aditya Bharadwaj
    2 days ago










  • $begingroup$
    What do you mean by "can see a single particle of light" and "but the light would just be bent by the eye"
    $endgroup$
    – Aditya Bharadwaj
    2 days ago


















2












$begingroup$

Both your teacher and strangers on the Internet are correct because you can see diverging rays of light coming from an object when you're focused on that object.



Let's take a look inside your eye. Light interacts with three parts of your eye: the cornea, the lens and the retina. The cornea and the lens work together to focus light onto the retina.



When you look an an object your unconscious brain will tell your eye to focus on the object. "Focusing" on an object means stretching out your lens to just the right focal length. "Just the right focal length" means that rays of light originating from the thing you're looking at converge at the same point on the retina.



enter image description here



You can see a point from one (or more) diverging rays of light because they all hit the same point on the retina. More is better because more light is easier to see.






share|cite|improve this answer











$endgroup$












  • $begingroup$
    Can you tell me why it is that more light rays from a single point means a much clearer picture.
    $endgroup$
    – Aditya Bharadwaj
    2 days ago










  • $begingroup$
    I think this question deserves to be asked on the top level.
    $endgroup$
    – lsusr
    2 days ago










Your Answer





StackExchange.ifUsing("editor", function ()
return StackExchange.using("mathjaxEditing", function ()
StackExchange.MarkdownEditor.creationCallbacks.add(function (editor, postfix)
StackExchange.mathjaxEditing.prepareWmdForMathJax(editor, postfix, [["$", "$"], ["\\(","\\)"]]);
);
);
, "mathjax-editing");

StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "151"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);

StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);

else
createEditor();

);

function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
noCode: true, onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);



);













draft saved

draft discarded


















StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fphysics.stackexchange.com%2fquestions%2f465606%2fcan-we-see-a-point-with-only-one-ray-or-do-we-need-two-rays%23new-answer', 'question_page');

);

Post as a guest















Required, but never shown

























2 Answers
2






active

oldest

votes








2 Answers
2






active

oldest

votes









active

oldest

votes






active

oldest

votes









4












$begingroup$

Both are correct in ways.



The eye changes its shape so that when you focus on a point, all the diverging light from that point is collected and redirected onto (roughly) the same detector on the back of your eye. (as in image B) However, in theory, you only need to collect a single photon to "see" a point (this corresponds more closely to A). Very sensitive light detectors can see a single particle of light, and IIRC, so can the eye if it is very dark.



In reality however, most objects emit light in all directions, so in realistic situations, B is the better picture. It's important to note that there are "an infinity" (in reality a large but finite number) of rays emitted in a cone from every point. There is nothing special about the ray distinguished in A. If you blocked the top ray in B, you'd still see the point, it would be the same situation as A, but the light would just be bent by the eye. Each additional ray simply adds to the amount of light collected by the eye, making the image more clear.






share|cite|improve this answer









$endgroup$












  • $begingroup$
    Just to make sure I understood it correctly. You are saying that one ray of light would not give our brain sufficient information to form a clear image, but a ray of light is the minimum amount of light needed to sense something although not very clearly. If two or more rays enter our eyes then we can recover more information about the object and we will be able to see a clearer image.Right?
    $endgroup$
    – Aditya Bharadwaj
    2 days ago










  • $begingroup$
    What do you mean by "can see a single particle of light" and "but the light would just be bent by the eye"
    $endgroup$
    – Aditya Bharadwaj
    2 days ago















4












$begingroup$

Both are correct in ways.



The eye changes its shape so that when you focus on a point, all the diverging light from that point is collected and redirected onto (roughly) the same detector on the back of your eye. (as in image B) However, in theory, you only need to collect a single photon to "see" a point (this corresponds more closely to A). Very sensitive light detectors can see a single particle of light, and IIRC, so can the eye if it is very dark.



In reality however, most objects emit light in all directions, so in realistic situations, B is the better picture. It's important to note that there are "an infinity" (in reality a large but finite number) of rays emitted in a cone from every point. There is nothing special about the ray distinguished in A. If you blocked the top ray in B, you'd still see the point, it would be the same situation as A, but the light would just be bent by the eye. Each additional ray simply adds to the amount of light collected by the eye, making the image more clear.






share|cite|improve this answer









$endgroup$












  • $begingroup$
    Just to make sure I understood it correctly. You are saying that one ray of light would not give our brain sufficient information to form a clear image, but a ray of light is the minimum amount of light needed to sense something although not very clearly. If two or more rays enter our eyes then we can recover more information about the object and we will be able to see a clearer image.Right?
    $endgroup$
    – Aditya Bharadwaj
    2 days ago










  • $begingroup$
    What do you mean by "can see a single particle of light" and "but the light would just be bent by the eye"
    $endgroup$
    – Aditya Bharadwaj
    2 days ago













4












4








4





$begingroup$

Both are correct in ways.



The eye changes its shape so that when you focus on a point, all the diverging light from that point is collected and redirected onto (roughly) the same detector on the back of your eye. (as in image B) However, in theory, you only need to collect a single photon to "see" a point (this corresponds more closely to A). Very sensitive light detectors can see a single particle of light, and IIRC, so can the eye if it is very dark.



In reality however, most objects emit light in all directions, so in realistic situations, B is the better picture. It's important to note that there are "an infinity" (in reality a large but finite number) of rays emitted in a cone from every point. There is nothing special about the ray distinguished in A. If you blocked the top ray in B, you'd still see the point, it would be the same situation as A, but the light would just be bent by the eye. Each additional ray simply adds to the amount of light collected by the eye, making the image more clear.






share|cite|improve this answer









$endgroup$



Both are correct in ways.



The eye changes its shape so that when you focus on a point, all the diverging light from that point is collected and redirected onto (roughly) the same detector on the back of your eye. (as in image B) However, in theory, you only need to collect a single photon to "see" a point (this corresponds more closely to A). Very sensitive light detectors can see a single particle of light, and IIRC, so can the eye if it is very dark.



In reality however, most objects emit light in all directions, so in realistic situations, B is the better picture. It's important to note that there are "an infinity" (in reality a large but finite number) of rays emitted in a cone from every point. There is nothing special about the ray distinguished in A. If you blocked the top ray in B, you'd still see the point, it would be the same situation as A, but the light would just be bent by the eye. Each additional ray simply adds to the amount of light collected by the eye, making the image more clear.







share|cite|improve this answer












share|cite|improve this answer



share|cite|improve this answer










answered 2 days ago









Bobak HashemiBobak Hashemi

1,5321718




1,5321718











  • $begingroup$
    Just to make sure I understood it correctly. You are saying that one ray of light would not give our brain sufficient information to form a clear image, but a ray of light is the minimum amount of light needed to sense something although not very clearly. If two or more rays enter our eyes then we can recover more information about the object and we will be able to see a clearer image.Right?
    $endgroup$
    – Aditya Bharadwaj
    2 days ago










  • $begingroup$
    What do you mean by "can see a single particle of light" and "but the light would just be bent by the eye"
    $endgroup$
    – Aditya Bharadwaj
    2 days ago
















  • $begingroup$
    Just to make sure I understood it correctly. You are saying that one ray of light would not give our brain sufficient information to form a clear image, but a ray of light is the minimum amount of light needed to sense something although not very clearly. If two or more rays enter our eyes then we can recover more information about the object and we will be able to see a clearer image.Right?
    $endgroup$
    – Aditya Bharadwaj
    2 days ago










  • $begingroup$
    What do you mean by "can see a single particle of light" and "but the light would just be bent by the eye"
    $endgroup$
    – Aditya Bharadwaj
    2 days ago















$begingroup$
Just to make sure I understood it correctly. You are saying that one ray of light would not give our brain sufficient information to form a clear image, but a ray of light is the minimum amount of light needed to sense something although not very clearly. If two or more rays enter our eyes then we can recover more information about the object and we will be able to see a clearer image.Right?
$endgroup$
– Aditya Bharadwaj
2 days ago




$begingroup$
Just to make sure I understood it correctly. You are saying that one ray of light would not give our brain sufficient information to form a clear image, but a ray of light is the minimum amount of light needed to sense something although not very clearly. If two or more rays enter our eyes then we can recover more information about the object and we will be able to see a clearer image.Right?
$endgroup$
– Aditya Bharadwaj
2 days ago












$begingroup$
What do you mean by "can see a single particle of light" and "but the light would just be bent by the eye"
$endgroup$
– Aditya Bharadwaj
2 days ago




$begingroup$
What do you mean by "can see a single particle of light" and "but the light would just be bent by the eye"
$endgroup$
– Aditya Bharadwaj
2 days ago











2












$begingroup$

Both your teacher and strangers on the Internet are correct because you can see diverging rays of light coming from an object when you're focused on that object.



Let's take a look inside your eye. Light interacts with three parts of your eye: the cornea, the lens and the retina. The cornea and the lens work together to focus light onto the retina.



When you look an an object your unconscious brain will tell your eye to focus on the object. "Focusing" on an object means stretching out your lens to just the right focal length. "Just the right focal length" means that rays of light originating from the thing you're looking at converge at the same point on the retina.



enter image description here



You can see a point from one (or more) diverging rays of light because they all hit the same point on the retina. More is better because more light is easier to see.






share|cite|improve this answer











$endgroup$












  • $begingroup$
    Can you tell me why it is that more light rays from a single point means a much clearer picture.
    $endgroup$
    – Aditya Bharadwaj
    2 days ago










  • $begingroup$
    I think this question deserves to be asked on the top level.
    $endgroup$
    – lsusr
    2 days ago















2












$begingroup$

Both your teacher and strangers on the Internet are correct because you can see diverging rays of light coming from an object when you're focused on that object.



Let's take a look inside your eye. Light interacts with three parts of your eye: the cornea, the lens and the retina. The cornea and the lens work together to focus light onto the retina.



When you look an an object your unconscious brain will tell your eye to focus on the object. "Focusing" on an object means stretching out your lens to just the right focal length. "Just the right focal length" means that rays of light originating from the thing you're looking at converge at the same point on the retina.



enter image description here



You can see a point from one (or more) diverging rays of light because they all hit the same point on the retina. More is better because more light is easier to see.






share|cite|improve this answer











$endgroup$












  • $begingroup$
    Can you tell me why it is that more light rays from a single point means a much clearer picture.
    $endgroup$
    – Aditya Bharadwaj
    2 days ago










  • $begingroup$
    I think this question deserves to be asked on the top level.
    $endgroup$
    – lsusr
    2 days ago













2












2








2





$begingroup$

Both your teacher and strangers on the Internet are correct because you can see diverging rays of light coming from an object when you're focused on that object.



Let's take a look inside your eye. Light interacts with three parts of your eye: the cornea, the lens and the retina. The cornea and the lens work together to focus light onto the retina.



When you look an an object your unconscious brain will tell your eye to focus on the object. "Focusing" on an object means stretching out your lens to just the right focal length. "Just the right focal length" means that rays of light originating from the thing you're looking at converge at the same point on the retina.



enter image description here



You can see a point from one (or more) diverging rays of light because they all hit the same point on the retina. More is better because more light is easier to see.






share|cite|improve this answer











$endgroup$



Both your teacher and strangers on the Internet are correct because you can see diverging rays of light coming from an object when you're focused on that object.



Let's take a look inside your eye. Light interacts with three parts of your eye: the cornea, the lens and the retina. The cornea and the lens work together to focus light onto the retina.



When you look an an object your unconscious brain will tell your eye to focus on the object. "Focusing" on an object means stretching out your lens to just the right focal length. "Just the right focal length" means that rays of light originating from the thing you're looking at converge at the same point on the retina.



enter image description here



You can see a point from one (or more) diverging rays of light because they all hit the same point on the retina. More is better because more light is easier to see.







share|cite|improve this answer














share|cite|improve this answer



share|cite|improve this answer








edited 2 days ago

























answered 2 days ago









lsusrlsusr

38115




38115











  • $begingroup$
    Can you tell me why it is that more light rays from a single point means a much clearer picture.
    $endgroup$
    – Aditya Bharadwaj
    2 days ago










  • $begingroup$
    I think this question deserves to be asked on the top level.
    $endgroup$
    – lsusr
    2 days ago
















  • $begingroup$
    Can you tell me why it is that more light rays from a single point means a much clearer picture.
    $endgroup$
    – Aditya Bharadwaj
    2 days ago










  • $begingroup$
    I think this question deserves to be asked on the top level.
    $endgroup$
    – lsusr
    2 days ago















$begingroup$
Can you tell me why it is that more light rays from a single point means a much clearer picture.
$endgroup$
– Aditya Bharadwaj
2 days ago




$begingroup$
Can you tell me why it is that more light rays from a single point means a much clearer picture.
$endgroup$
– Aditya Bharadwaj
2 days ago












$begingroup$
I think this question deserves to be asked on the top level.
$endgroup$
– lsusr
2 days ago




$begingroup$
I think this question deserves to be asked on the top level.
$endgroup$
– lsusr
2 days ago

















draft saved

draft discarded
















































Thanks for contributing an answer to Physics Stack Exchange!


  • Please be sure to answer the question. Provide details and share your research!

But avoid


  • Asking for help, clarification, or responding to other answers.

  • Making statements based on opinion; back them up with references or personal experience.

Use MathJax to format equations. MathJax reference.


To learn more, see our tips on writing great answers.




draft saved


draft discarded














StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fphysics.stackexchange.com%2fquestions%2f465606%2fcan-we-see-a-point-with-only-one-ray-or-do-we-need-two-rays%23new-answer', 'question_page');

);

Post as a guest















Required, but never shown





















































Required, but never shown














Required, but never shown












Required, but never shown







Required, but never shown

































Required, but never shown














Required, but never shown












Required, but never shown







Required, but never shown







Popular posts from this blog

How should I support this large drywall patch? Planned maintenance scheduled April 23, 2019 at 00:00UTC (8:00pm US/Eastern) Announcing the arrival of Valued Associate #679: Cesar Manara Unicorn Meta Zoo #1: Why another podcast?How do I cover large gaps in drywall?How do I keep drywall around a patch from crumbling?Can I glue a second layer of drywall?How to patch long strip on drywall?Large drywall patch: how to avoid bulging seams?Drywall Mesh Patch vs. Bulge? To remove or not to remove?How to fix this drywall job?Prep drywall before backsplashWhat's the best way to fix this horrible drywall patch job?Drywall patching using 3M Patch Plus Primer

random experiment with two different functions on unit interval Announcing the arrival of Valued Associate #679: Cesar Manara Planned maintenance scheduled April 23, 2019 at 00:00UTC (8:00pm US/Eastern)Random variable and probability space notionsRandom Walk with EdgesFinding functions where the increase over a random interval is Poisson distributedNumber of days until dayCan an observed event in fact be of zero probability?Unit random processmodels of coins and uniform distributionHow to get the number of successes given $n$ trials , probability $P$ and a random variable $X$Absorbing Markov chain in a computer. Is “almost every” turned into always convergence in computer executions?Stopped random walk is not uniformly integrable

Lowndes Grove History Architecture References Navigation menu32°48′6″N 79°57′58″W / 32.80167°N 79.96611°W / 32.80167; -79.9661132°48′6″N 79°57′58″W / 32.80167°N 79.96611°W / 32.80167; -79.9661178002500"National Register Information System"Historic houses of South Carolina"Lowndes Grove""+32° 48' 6.00", −79° 57' 58.00""Lowndes Grove, Charleston County (260 St. Margaret St., Charleston)""Lowndes Grove"The Charleston ExpositionIt Happened in South Carolina"Lowndes Grove (House), Saint Margaret Street & Sixth Avenue, Charleston, Charleston County, SC(Photographs)"Plantations of the Carolina Low Countrye