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Light enters at an angle of incidance in...

Light enters at an angle of incidance in a tranjsparent road of refractve index `mu.` for what value of the refractive index of the material of the rod the light once entered into it will not leave it through its lateral face whatsoever be the value of angle of incidance ?

A

`mugtsqrt2`

B

`mu=1`

C

`mu=1.1`

D

`mu=1.3`

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The correct Answer is:
A
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