The figure shows `XY` separating two transparent media, medium-`1` and medium-`2.` The lenes ab and `cd` represent wavefronts of a light wave travelling in medium-`1` and incident on `XY.` The lines `rf` and `gh` represent wavefronts of the light wave in medium-`2` after refraction. The phases of the light wave at `c,d,e` and `f` are `phi_(c) ,phi_(d),phi_(e)` and `phi_(f)` respectively. It is given that `phi_(c)=phi_(f)` :A. `phi_(c)` cannot be equal to `phi_(d)`B. `phi_(d)` cannot be equal to `phi_(e)`C. `(phi_(d)-phi_(f))` is equal to `(phi_(c)-phi_(e))`D. `(phi_(d)-phi_(c))` is equal to `(phi_(f)-phi_(e))`

The figure shows `XY` separating two transparent media, medium-`1` and

1.	The figure shows `XY` separating two transparent media, medium-`1` and medium-`2.` The lenes ab and `cd` represent wavefronts of a light wave travelling in medium-`1` and incident on `XY.` The lines `rf` and `gh` represent wavefronts of the light wave in medium-`2` after refraction. The phases of the light wave at `c,d,e` and `f` are `phi_(c) ,phi_(d),phi_(e)` and `phi_(f)` respectively. It is given that `phi_(c)=phi_(f)` :A. `phi_(c)` cannot be equal to `phi_(d)`B. `phi_(d)` cannot be equal to `phi_(e)`C. `(phi_(d)-phi_(f))` is equal to `(phi_(c)-phi_(e))`D. `(phi_(d)-phi_(c))` is equal to `(phi_(f)-phi_(e))`
Answer» Correct Answer - C `c` and `d` are at same wavefronts So, `phi_(c)=phi_(d)` and `phi_(e)=phi_(f)` `therefore phi_(d)-phi_(f)=phi_(c)-phi_(f)` `D` is incorrect `phi_(d)-phi_(c)=0` `phi_(f)-phi_(e)=0` So both should be equal.

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