All Questions
10
questions
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Why do you think people may have different iris but their pupil are black and why when you push your eye at bottom you see two image? [closed]
Why do you think people my have different iris but their pupil are black?
5
votes
3
answers
2k
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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
200
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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
0
votes
2
answers
42
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Is their a way to protect screens from being recorded? [closed]
This idea might sound stupid but...
Is there a way a screen would be impossible to record using a prism? I’m not talking recorded by a software but recorded from a camera…
If you put a prism layer in ...
- 11
1
vote
2
answers
812
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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
9
votes
7
answers
23k
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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
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2
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6k
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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
1
vote
2
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3k
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Why do my friend's glasses make things look blurry when I put them on?
Yesterday I tried on my friend's glasses and noticed that they made everything look blurrier and farther away. If they do this to my vision, how can they make things look clearer and closer for him?
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1
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2
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5k
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The color purple in a rainbow
In a rainbow the colors order is red then orange (made from red and yellow, thus making sense that it appears in between them) the yellow followed by green after which comes blue (again green formed ...
- 11
10
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1
answer
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Purple doesn't occur in rainbow - or does it?
Usually, when asked whether the purple color exists rainbows, an answer similar to this is given:
The purple color is perceived by human eyes via the activation of both red-sensitive and blue-...
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