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A ray of light travelling in air haves w...

A ray of light travelling in air haves wavelength `lambda`, frequency n, velocity v and intensity I. If this ray enters into water then these parameter are `lambda`', n' , v' and I' respectively. Which relation is correct

A

`lamda=lamda'`

B

n = n'

C

v = v'

D

l = l'

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The correct Answer is:
B
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