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Question

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 slabs
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  1. 60
  2. 45
  3. 30
  4. 75

A
45
B
75
C
30
D
60
Solution
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θcricm1m2=sin1(32)=600

θcricm2m3=sin1(12)=450

θ600

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