What is the phase velocity of light in glass?

AI Thread Summary
The phase velocity of light in glass with a refractive index (n) of 1.5 is calculated using the formula vp = c/n, where c is the speed of light in a vacuum. Substituting the values, vp is determined to be 2 x 10^8 m/s. The wavelength of light (λ=500nm) is not necessary for this calculation, as the refractive index already accounts for the medium's properties. While n can vary with wavelength, it does not affect the phase velocity in this context. The solution confirms the correctness of the approach used.
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Homework Statement



What is the phase velocity of light in glass if n=1.5 at λ=500nm

Homework Equations



n=c/vp =λ0/λ


The Attempt at a Solution



1.5 = (3x10^8) / vp
vp = (3x10^8)/1.5

I'm not entirely sure if the equation I have used is the correct one. It does not use the λ=500nm as given in the question.
 
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It is right, and you do not need the wavelength. In general, n will depend on the wavelength, but that is not relevant here.
 
Thanks mfb!
 
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