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A ray of light travelling in a transpare...

A ray of light travelling in a transparent medium of refractive index n falls, on a surface separating the medium from air at an angle of incidents of `45^@`. The ray can undergo total internal reflection for the following n,

A

`mu=1.33`

B

`mu=1.40`

C

`mu=1.50`

D

`mu=1.25`

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