All Questions
321
questions
15
votes
2
answers
2k
views
Eye Floaters Optics
Eye floaters are these annoying objects floating in someones eye, usually seen by someone experiencing them as squiggly lines and dots buzzing around, either dark or partially transparent (I ...
- 153
-4
votes
1
answer
83
views
Why does a ventilator appear to run leftwise and rightwise and back when spinning up?
My university professor, a friend of mine, asked me: "Do you know why, when a ventilator starts and during the process up to final speed, it runs clockwise and anticlockwise and back again to ...
- 125
1
vote
1
answer
39
views
Is it possible to see thermal columns?
The most common way gliders gain altitude is to circle in a thermal. Thermals are often found below cumulus clouds, or above dark areas on the ground. Without these signs, they are harder to find and ...
- 111
2
votes
3
answers
224
views
What is the apparent location of a real image formed by a lens? [duplicate]
Let's say I place a tennis ball 1 m in front of a plane mirror. The mirror will form a virtual image of the tennis ball, and if I look in the mirror, it appears to me that there is a tennis ball ...
- 8,344
1
vote
1
answer
43
views
Why do we see objects with a given color?
I'm currently studying Electromagnetic Optics, and I don't quite understand the (classical) process through which we perceive an object with a given color. From my understanding, I'd make a ...
- 1,629
7
votes
6
answers
4k
views
Why does white light appear white?
When I think of white light, I'm imagining a combination of all 7 colors of light but I believe that since light has wave nature I can say that at some point that the probability density of red light ...
- 93
0
votes
2
answers
123
views
Why do I seem to see more depth in images when closing one eye?
I remember that when researching and learning about vanishing points and vantage points of art pieces, that by closing one eye and viewing a painting from an exact point in space, it would give this ...
- 103
0
votes
0
answers
23
views
Effects of chromatic aberration in the human eye
Due to metamerism, many different light spectra can be used to show a white colour.
If I understand it correctly, it is even possible to make white light by combining only two monochromatic light ...
3
votes
2
answers
215
views
How could RGB color system compose a violet color?
In the GRB system, we combine the three primary colors, red, green, and blue, to make some new colors.
It's easy to understand the production of yellow because the wavelength of yellow is between red ...
- 141
0
votes
1
answer
80
views
How to explain interference pattern in our eye?
Suppose we got a Lamp L that emits some light. The light afterwards hits a diffraction Grating G at a distance a. Now if you were to look through the grating with your Eye E, you were to see the ...
- 462
-1
votes
2
answers
58
views
How do dark color varies from people when seeing the back of their eyelids?
Depending on the light source, the back of people's eyelids either be black or dark gray depending on what lit environment they're in? the how does eyes function when people have the back of their ...
3
votes
2
answers
947
views
Would the "FFT" of a light source be a reliable indicator of perceived color?
Paraphrasing from here:
A purely monochromatic 575nm wavelength light would be "perceived" as yellow, as would a light that has equal components in red and green (but no yellow). However, ...
- 139
-4
votes
1
answer
84
views
What's a safe, easily executable experiment to confirm that quantization of light occurs directly to the retina? [closed]
What's a safe, easily executable experiment to confirm that quantization of light occurs directly to the retina.
We know that light is quantized when projected on to a surface, or on to an inanimate ...
1
vote
0
answers
70
views
Does our sense of color depend on frequency of source or the wavelength of light?
I was taught that the colors we see are results of the corresponding wavelength, but each wavelength also has a distinct frequency since speed of light is fixed for a specific medium (same goes for ...
- 169
0
votes
0
answers
42
views
Why would an object disappear when switching from monocular to binocular vision?
I have just used a compound binocular microscope which has an ‘eyepiece graticule’ (ruler in arbitrary units) in the right eyepiece lens.
If you close your left eye (or occlude the left lens), the ...
