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## Homework Statement

A light beam of wavelenght 500nm travels from A to B in vacuum. (AB = 10mm)

If we put a glass sheet with n=1.5 and 1mm thick, calculate how change the number of periods. Calculate the phase lag too.

## Homework Equations

k0 = 2Pi/λ (vacuum)

k= k0·n

## The Attempt at a Solution

If in the vacuum the wave gas a wavelenght λ=2Pi/k0, into a n=1.5 glass, it will have λ'=2Pi·n/k0 (?)

Thanks