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What is the minimum value of the refract...

What is the minimum value of the refractive index for a `90^(@)-45^(@)-45^(@)` prism which is used to deviate a beam through `90^(@)` by total internal reflection ?

A

`3//2`

B

`sqrt(3)`

C

`sqrt(2)`

D

`5//3`

Text Solution

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The correct Answer is:
C
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