Question

AB and CD are two slabs. The medium between the slabs has refractive index 2. Find the minimum angle of incidence (in degrees) at Q so that the ray is totally reflected by both the slabs.

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JEE Mains
Solution
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Let the minimum angle be
For first surface to completely reflect, =>
 =>

For second surface to completely reflect, =>
=> 

So  satisfies both condition

Answer. Minimum angle of incidence so as to totally reflect from both surface is


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