AB and CD are two slabs. The medium between the slabs has refractive index as shown in the figure. Minimum angle of incidence (in degrees) at Q , so that the ray is totally reflected by both the slabs is a

Question

AB and CD are two slabs. The medium between the slabs has refractive index as shown in the figure. Minimum angle of incidence (in degrees) at Q , so that the ray is totally reflected by both the slabs is a, 60, 30, 45, 15

MARKS App · Accepted Answer

Critical angles at 1 and 2 θ c 1 = sin -1 μ 1 μ 2 = sin -1 1 2 = 4 5 0 θ c 2 = sin -1 μ 3 μ 2 = sin -1 3 2 = 6 0 0 Therefore, minimum angle of incidence for total internal reflection to take place on both slabs should be 60 0

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