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The figure shows a surface XY separating...

The figure shows a surface XY separating two transparent media, mediam-1 and medium-2. The lines do and cd represent wavefronts of a light wave travelling in medium-1 and incident XY. The lines ef and gh represent wavefronts of the light wave in medium-2 after refraction.
Q. Speed of light is

A

`phi_(c)` cannot be equal to `phi_(c)`

B

`phi_(d)` can be equal to `phi_(e)`

C

`(phi_(d)-phi_(f))` is equal to `(phi_(c)-phi_(e))`

D

`(phi_(d)-phi_(c))` is not equal to `(phi_(f)-phi_(e))`

Text Solution

Verified by Experts

The correct Answer is:
C
Point c and d are on the same wave fronts.
`phi_(C)=phi_(d)`
Also `phi_(c)=phi_(f)` so clearly `phi_(d)-phi_(f)=phi_(c)-phi_(e)`
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