1.

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)`

Answer» Correct Answer - B
If `v_(2)1gtA_(1)B_(2)`, then refrected wavefront will be absent. (Not possible to draw wavefront)


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