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# AB and CD are two slabs. The medium between the slabs has refractive index 2. Find the minimum angle of incidence at Q so that the ray is totally reflected by both the slabs60∘45∘30∘75∘

A
45
B
75
C
30
D
60
Solution
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#### θcricm1m2=sin−1(√32)=600θcricm2m3=sin−1(1√2)=450θ≥600

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