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A 90^@ corner is made from a transparen...

A `90^@` corner is made from a transparent optical material with a refractive index such that A cannot see B when he is standing behind the corner. Minimum value of refractive index is

A

`sqrt(3)`

B

`sqrt(2)`

C

`sqrt(5)`

D

`sqrt(7)`

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The correct Answer is:
B
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