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In the figure shown , for an angle of in...

In the figure shown , for an angle of incidence `45^(@)`, at the top surface , what is the minimum refractive index needed for the internal reflection at vertical face ?

A

`(sqrt2+1)/(2)`

B

`sqrt((1)/(2))`

C

`sqrt((3)/(2))`

D

`sqrt2+1`

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The correct Answer is:
C
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