change in velocity of light with change in optical density


by utkarsh009
Tags: density, light, optical, velocity
utkarsh009
utkarsh009 is offline
#1
Jan28-11, 11:49 AM
P: 34
hey guys! we know that velocity of a wave = wavelength x frequency. and speed of light changes with change in optical density. so there must be change in either frequency or wavelength or both. which of these quantities change with change in optical density? and why?
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Andy Resnick
Andy Resnick is offline
#2
Jan28-11, 02:38 PM
Sci Advisor
P: 5,467
The wavelength changes by l' =l/n, where n is the (real part of the) index of refraction. The wavelength changes instead of the frequency because the momentum is given by wavelength, while energy is given by frequency.


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