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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) : |
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Answer» `phi_(C)` cannot be equal to `phi_(d)` 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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