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.

Hard
JEE Mains
Solution
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## Let the minimum angle be For first surface to completely reflect, =>  =>For second surface to completely reflect, => => $\alpha \geqslant 60^\circ$So $\alpha \geqslant 60^\circ$ satisfies both conditionAnswer. Minimum angle of incidence so as to totally reflect from both surface is

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