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Light enters at an angle of incidence in...

Light enters at an angle of incidence in a transparent rod of refractive index n of the material of the rod. Find the range of n so that the light once entered into it will not leave it through its lateral face, the value of angle of incidence.

A

n = 1.1

B

n = 1

C

`ngtsqrt2`

D

n = 1.3

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The correct Answer is:
C
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