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Questions related to the perception and measurement of light (primarily in the visible range), its mathematical description, the reproduction of colors by different means, color combinations, etc. Please use the tag [electromagnetic-radiation] if you want to refer to the general form of light.

4
votes
It's possible to see the wavelengths beyond the red using non-linear optics: Second harmonic generation. Basically two photons combine to form a twice more energetic photon. Green laser works this way …
answered May 14 '13 by Calmarius
1
vote
1answer
This site shows locations of the high order rainbows up to sixth order. My thought is that, There should be even higher order bows like 7th, 8th, etc. (Though they would be practically impossible to o …
asked Oct 27 '12 by Calmarius
5
votes
1answer
I have multiple sub-questions but they are related. What would the object look like if in were passing by? What would a star look like if we were traveling near $c$? Would the perspective be a a l …
asked Oct 1 '12 by Calmarius
0
votes
So far only one thing is sure about the black holes: they are exist. There is something in the galactic center that does not radiate energy but stars nearby orbit it at high speeds. It must be a black …
answered Apr 30 '13 by Calmarius
1
vote
It act as a wave, but this wave is a probability density function, which describes the chances to hit a particular location of the detector. You cannot predict where it strikes, but if you fire enoug …
answered Jun 15 '13 by Calmarius
1
vote
Here is a different explanation. Due the equality principle standing on the surface of a planet and accelerating is equal. Far from massive bodies, fixed proper acceleration leads to a hyperbolic tr …
answered Jun 9 '13 by Calmarius