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Electromagnetic waves of frequency 1.2xx...

Electromagnetic waves of frequency `1.2xx10^(15)Hz` enters into water and subsequently into glass from vacuum. Which of the following graphs correctly represent the variation of frequency `f` with medium? (Given that indices of refraction for water and glass are `4//3` and `3//2` respectively).

A

B

C

D

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The correct Answer is:
A
Frequency memains unchanged as electromagnetic waves pass from one medium to another .
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