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Light enters at an angle of incidence in...

Light enters at an angle of incidence in a transparent rod of material of refractive index `mu`. The light once entered into it will not leave it through its lateral face, whatsoever be the value of angle of incidence, if

A

`mugtsqrt2`

B

`mu=1`

C

`mu=1.1`

D

`mu=1.3`.

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MODERN PUBLICATION-UNIT TEST -06-EXERCISE
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  6. Twinkling of stars is due to atmospheric:

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  9. An air bubble inside the water behaves as:

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