A light ray of frequency v and wavelength `lambda` enters a liquid of refractive index `3//2`. The ray travels in the liquid with

Options

A. (a) frequency v and wavelength `(2/3)lambda`
B. (b) frequency v and wavelength `(3/2)lambda`
C. (c) frequency v and wavelength `lambda`
D. (d) frequency `(3/2)v` and wavelength `lambda`

Answer

A

Explanation

`mu=c/v=(vlambda)/(vlambda^')`
`3/2=lambda/lambda^'` or `lambda^'=(2lambda)/(3)`
Note that the frequency remains unchanged.