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    Yusf's Avatar
    Yusf Posts: 197, Reputation: 3
    Junior Member
     
    #1

    Sep 29, 2016, 02:58 PM
    Need help about phase difference.
    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's Avatar
    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 . Hence the number of cycles that the light wave experiences while traveling through the material is . Meanwhile the light ray that does not go through the material experiences cycles. The difference represents the phase shift, in cycles - be sure to convert to radians.
    Yusf's Avatar
    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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