Yusf Posts: 197, Reputation: 3 Junior Member #1 Sep 29, 2016, 02:58 PM
Please give me a hint on how to solve this. I have no idea how to start.
Two parallel light rays of wavelength λ originate from the same light source. During
Their journey, one of them had to go through a transparent slab of thickness l and
Refractive index n. Find their phase difference.
 ebaines Posts: 12,132, Reputation: 1307 Expert #2 Oct 5, 2016, 02:35 PM
Consider that the wavelength of the light whilst in the material is equal to $\lambda/n$. Hence the number of cycles that the light wave experiences while traveling through the material is $\frac I {\lambda /n}$. Meanwhile the light ray that does not go through the material experiences $I/ \lambda$ cycles. The difference represents the phase shift, in cycles - be sure to convert to radians.
 Yusf Posts: 197, Reputation: 3 Junior Member #3 Oct 8, 2016, 11:29 AM
Understood. Thanks.
I have now prepared a complete working of this based on this answer and my understanding.

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