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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 slabs

6686

A

60 $^{\circ}$

B

45 $^{\circ}$

C

30 $^{\circ}$

D

75 $^{\circ}$

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Solution

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Correct option is A)

$θ_{c r i c} m_{1} m_{2} = s i n^{- 1} (\frac{3}{2}) = 6 0^{0}$

$θ_{c r i c} m_{2} m_{3} = s i n^{- 1} (\frac{1}{2}) = 4 5^{0}$

$θ \geq 6 0^{0}$

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