Physics

Problem

A ray of light of intensity

I

is incident on a parallel glass-slab at a point as shown in figure. It undergoes partial reflection and refraction. At each reflection 20% of incident energy is refracted. The rays

AB

and

A'B'

undergo interference. Find the ratio

I_{\max}/I_{\min}

. ![Diagram illustrating the setup for interference. A ray of light is incident on a parallel glass slab. At the first interface (A), it undergoes partial reflection (ray AB) and partial refraction (ray AA'). The refracted ray AA' travels through the slab and undergoes partial reflection (ray A'B') and partial refraction (ray A'B). The rays AB and A'B' are shown to undergo interference.](https://storage.googleapis.com/diraq-contents/homework-question-parsing/marker/20260106T182719Z/7dc6233252474da3b23fe67954b2c0f0/64662465bba247703fdec49c8f3309f9_img.jpg)

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