Q 2407591488.     In the figure given below, for an angle of
incidence `45^0` at the top surface, what is the
minimum refractive index need to total
internal reflection at vertical face?

BCECE 2015 Stage 1
A

`(sqrt2+1)/2`

B

`sqrt(1/2)`

C

`sqrt(3/2)`

D

`sqrt2+1`

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