Question

A monochromatic light is travelling in a medium of refractive index . It enters a stack of glass layers from the bottom side at an angle . The interfaces of the glass layers are parallel to each other. The refractive indices of different glass layers are monotonically decreasing as , where is the refractive index of the slab and (see the figure). The ray is refracted out parallel to the interface between the and slabs from the right side of the stack. What is the value of

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Solution
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Correct option is A)

 Given,

 

 

 

Using Snell's Law,






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