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A plane wavefront A(1)B(1) is incident a...

A plane wavefront `A_(1)B_(1)` is incident at a boundary `A_(1)B_(2)` as shown. It takes time tau for the wavefront to travel from `B_(1)` to `B_(2)` Speeds of propagation of light in medium 1 and 2 are `v_(1) & v_(2)` respectively and `v_(2) gt v_(1)`. For the total internal reflection of wavefront :-

A

`v_(1)taugtA_(1)B_(2)`

B

`v_(2)taugtA_(1)B_(2)`

C

`v_(1)taultA_(1)B_(2)`

D

`v_(2)tau lt A_(1)B_(2)`

Text Solution

Verified by Experts

The correct Answer is:
B
If `v_(2)1gtA_(1)B_(2)`, then refrected wavefront will be absent. (Not possible to draw wavefront)
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