Electromagnetic radiation of frequency `n`, wavelength `lambda`, travelling with velocity v in air, enters a glass slab of refractive index `mu`. The frequency, wavelength and velocity of light in the glass slab will be respectively

Options

A. `(n)/(mu),(lambda)/(mu) and (v)/(mu)`
B. `n,(lambda)/(mu) and (v)/(mu)`
C. `n, 2lambda and(v)/(mu)`
D. `(2n)/(mu),(lambda)/(mu) and v`

Answer

B

Explanation

We know that frequency of electromagnetic radiation remains the same when it changes the medium.
`mu=("wavelength of light in vacuum")/("wavelength of light in medium")=(lambda_(v))/(lambda_(m))`
`lambda_(m)=(lambda_(v))/(mu)=(lambda)/(mu)`
`"Similarly, "mu=("velocity of light in vacuum")/("velocity of light in medium")`