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A ray falls on a prism ABC(AB=BC) and tr...

A ray falls on a prism `ABC(AB=BC)` and travels as shown in adjoining figure.The minimum refraction index of the prism material should be -

A

43558

B

`sqrt2`

C

1.5

D

`sqrt3`

Text Solution

Verified by Experts

The correct Answer is:
B
(b) Angle I at bothfocus will be `45^(@)`. For TIR to take place,
`igttheta_(C) or sinigtsintheta_(C)`
`therefore 1/sqrt2gt1/muor mugtsqrt2`
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