Question: 1 . Show in multiple reflections in a thin film, the optical path difference between two adjacent reflections rays, e . g . , 1

1. Show in multiple reflections in a thin film, the optical path difference between two adjacent reflections rays, e.g.,1st reflection and 2nd reflection, is =2_(_), where _ is the refractive index of thin film, is thin film thickness and _ is the angle of transmission.

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