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An electromagnetic wave of wavelength la...


An electromagnetic wave of wavelength `lamda_(0)` (in vacuum) passes from P towards Q crossing three difference media of refractive index `mu,2mu` and `3mu` respectively as shown in figure `phi_(P)` and `phi_(Q)` be the phase of the wave at points P and Q. Find the phase difference `phi_(Q)-phi_(P)`. [take `mu=1`]

A

0

B

`pi/4`

C

`pi/2`

D

`pi`

Text Solution

Verified by Experts

The correct Answer is:
3
Optical path difference between (OPD) P & Q
(O.P.D.)=2.25`lambda_(0)xx1+(3.5lambda_(0))xx2+3lambda_(0)xx3 =18.25lambda_(0)` and phase difference `Delta phi=(2pi)/lambda_(0) xxDeltax=pi/2`
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