Q 1222623531.     A right angled prism is to be made by selecting a proper material and the angles `A` and `B` (`B ≤ A`), as shown in figure. It is desired that a ray of light incident on the face `AB` What should be the minimum refractive index for this to be possible?

JEE 1987
A

`3sqrt2`

B

`sqrt2`

C

`2sqrt2`

D

`sqrt6`

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