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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.

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Aragos or Poisson spot During the 19th century scientists were still undecided if light is a wave phenomenon or consisting of particles. Poisson thought he refuted the wave theory by predicting corre …
answered Oct 26 '15 by Thorsten S.
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Some corrections: The color does not darken in the sense that it is getting black, but the brightness diminishes. Every color is getting black if you put a neutral filter before which only reduces bri …
answered Jan 11 '18 by Thorsten S.
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engineer already answered it completely, I only want to add that the question is completely valid even if you already know that separation of wavelength occurs. The thing is, some materials are pract …
answered May 21 '15 by Thorsten S.
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Color is not a physical phenomenon, it is how light of different frequencies/wavelength are perceived by humans. While the cones are developed by our animal ancestors and we share them with other spec …
answered Jul 29 '16 by Thorsten S.
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The feeling depends on three factors: Obviously the temperature the specific heat the thermal conductivity What happens is that once your finger is on the material, heat is exchanged. The molecule …
answered Jul 31 '16 by Thorsten S.
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In addition to the other answers: Even if you had extremely clear glass (like for optical fibers), stacking them would cause them to get more quickly opaque than what would be expected by their transm …
answered Jan 4 '17 by Thorsten S.