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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 gt sqrt(2)`

B

`n=1`

C

`n=1.1`

D

`n=1.3`

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A
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