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In which color human eye is most sensitive?

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An additional question: what is the quantum efficiency of the eye? –  nibot Jan 17 '11 at 16:27
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Around 555nm wavelength - green color. That's why green lasers are soo cool even at 10 mW :-D

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you can put that link in a ![alt text](http://upload.wikimedia.org/wikipedia/commons/e/e9/Eyesensitivity.png) construct to have it shown here directly –  Tobias Kienzler Jan 17 '11 at 15:40
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Answer to the additional question: "what is the quantum efficiency of the eye?" I remember old studies reporting that eight photons reaching the photoreceptors can be detected by a human observer as a flash of light in certain laboratory conditions. The more normal range would certainly be lower than 0.125 say 0.05 - 0.01. Cooling down laboratory animals thus reducing thermal noise in the retina enhances sensitivity but means longer integration times and lower spatial and temporal resolution.

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A little late to the party, but this is a nice article that explains those studies and has the references: desy.de/user/projects/Physics/Quantum/see_a_photon.html –  Arnoques Nov 26 '11 at 5:03
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