All Questions
20
questions
2
votes
3
answers
1k
views
How do we perceive object distance in refraction/reflection?
Suppose we have some object, from which light rays reflect off and reach our eye. In this example, we can directly see this object, and the image is formed on our retina.
However, consider a coin kept ...
- 493
3
votes
1
answer
4k
views
Why I see everything which is red in 3D with my prescription eyeglasses?
I have prescription eyeglasses with -1.5D power (Myopia). I have been wearing eyeglasses for past 5 years and recently changed to blue light filter ones. Now I recognise everything red in colour as a ...
5
votes
3
answers
2k
views
Why do different colors appear to move at different rates when I shift my head while wearing eyeglasses?
I have significant nearsightedness (and some astigmatism), but see just fine with eyeglasses. One phenomenon I've noticed is that when I shift my head side to side or up and down while keeping my ...
- 181
0
votes
1
answer
79
views
Why when looking at a laser's reflection the laser appears to have a ring of noise around the central beam?
When pointing my presentation laser at a semi glossy object like stained wood or my skin I see noise, almost like TV static (it also appears to be moving). Is this a property of the laser's refraction ...
- 103
0
votes
1
answer
200
views
Why the color of light observed dark (almost no light) from section of overlapping of two different colored plastic sheets?
Two transparent plastic sheets say of red and blue color overlap as shown in figure . An observer looks at a clear sky through the sheets.
He will observe light coming through sections as,
SECTION 1: ...
- 121
1
vote
0
answers
66
views
Will myopic vision be improved while diving?
Why does my myopic vision improve under water while wearing a diving mask, compared to my normal vision on land?
- 11
0
votes
0
answers
24
views
How large will my buddy's eyes appear underwater while wearing goggles?
My buddy and I are underwater scuba diving.
We are both wearing diving masks.
I know an object in the water will appear 1.33 times larger.
But how large will my buddy's eyes appear inside of his ...
- 11
1
vote
2
answers
812
views
Why does purple appear in a rainbow?
It is said that people and digital cameras have color sense only for red, green and blue. So when we see violet/purple in a rainbow, whether with our eyes or in a photo, we should be seeing a color ...
- 195
2
votes
1
answer
93
views
Refractive screen for myopia [closed]
Is it possible to create a screen for a computer monitor to allow a Myopic person to see the screen without glasses?
9
votes
3
answers
6k
views
Refraction: Swimming goggles, short-sightedness, and underwater vision
I have thought of this question due to personal experience. I am short-sighted, and over the last three years my short-sightedness has worsened. Taking a lifeguard certificate again now that I did ...
- 191
2
votes
1
answer
526
views
What would happen if the aqueous and vitreous humour of a human's eye are replaced by some harmless transparent liquid of different refractive index?
The title says it all. What would the person be able to see?
Note
By harmless, I mean that it is non-corrosive, non-toxic, etc. The liquid doesn't cause any biological damage to the eye or any other ...
- 291
9
votes
7
answers
23k
views
Why can we only "see" reflected light? [duplicate]
This is a question thats been bothering me a while. I don't even know if it makes sense or not (like if it is a physics question or becoming a philosophical one). But here it goes. The crux of my ...
- 823
0
votes
2
answers
6k
views
How is light able to form images? [duplicate]
Everyday we see ourselves in mirror and this is due to light which forms our image after reflection ( may be refraction sometimes) . But I wonder how can light carry the image. How is it possible that ...
- 1,147
5
votes
0
answers
7k
views
What is Curvature of eye lens?
I wanted to know what do we mean by "curvature of eye lens", is it the reciprocal of $r$ i.e $c=1/r$ or is it synonymous to radius of curvature of the eye lens. Moreover how does aperture relate to ...
- 159
6
votes
2
answers
833
views
Glasses underwater
So I figured the refraction of the cornea is based on the index of air and the vitrous humor to make a perfect image. Underwater this is messed with because water has the same index as the eye. Hence ...
- 61