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Light enters an isosceles right triangul...

Light enters an isosceles right triangular prism at normal incidence through face AB and undergoes total internal reflection at face BC as shown below.
The minimum value of the refractive index of the prism is close to

A

`1.10`

B

`1.55`

C

`1.42`

D

`1.72`

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The correct Answer is:
C
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