If you immerse RGB (red-green-blue) light sources in the pool of water, then will the colors of light change? The detector senses the photon energy, whereas we uderstood from the basic laws of classical electromagnetism that the photon energy may remain invariant propagating through a refractive medium. Hence, if frequency dictates the color of light, what happens for the corresponding shortened wavelength during the the propagation. Conversely, the light frequency and the photon energy changes due to Doppler effect facing red or blue spectral shift !
In vision the wavelength is determined by the fluid of the eye and it is indifferent of the index of refraction outside. Therefor for human what important is the frequency. Now for a detector it depends on its construction. I guess that it is not hard to built something similar to the eye in this sance.
In vision the wavelength is determined by the fluid of the eye and it is indifferent of the index of refraction outside. Therefor for human what important is the frequency. Now for a detector it depends on its construction. I guess that it is not hard to built something similar to the eye in this sance.
Color is defined by the frequency. The wavelength changes according to the medium and if the light enters a glass it slows down,so the wavelength of the light shortens proportionally,and since we have: f=c/λ , the frequency remains the same.
According to Planck principles, photon energy and then photon frequency are invariant, hence color may be attributed to the photon energy.
I repeat my question:
There are RGB sources in the pool and we look at those light sources where we detect the light as RGB colors. Then, we use a spectral band pass filter to block the red light (for instance), but the light wavelength shortens by 1/n factor and it resembles not to be red any longer propagating in water according to interference filter performance!
Does it transmit through the filter or not? can we sense the red light afterwards?
Parviz, Colour is a psychophysical phenomenon - that is it is a response of the visual system to some physical phenomenon. If the light received by the sensors in the eye from two light sources is the same then, as a first approximation, the visual response will be the same. The photon energy, as others above have implied, is dependent on the frequency of the light (E = h*frequency/lambda), and this determines the chemical response that initiates transduction to the visual cortex. Frequency of the photon travelling from the source - irrespective of the various media through which it might travel (assuming we are only dealing with passive media, such as water and air) - is invariant. Your filter is probably frequency selective rather than wavelength selective, so if it is transmissive for the frequencies of red light in air then so it would be in water. However, if it were an interference filter we would have to assess the impact of water immersion on the interference characteristics that lead to wavelength-based selection.
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