Monochromatic light is refracted from air into the glass of refractive index `mu` . The ratio of the wavelength of incident and refracted waves is

Options

A. `1: mu`
B. `1:mu^2`
C. `mu :1`
D. `1 :1`

Answer

C

Explanation

As we know,
`lambda prop 1/(mu)`
`(lambda_1)/(lambda_2) = (mu_2)/(mu_1) = (mu)/1`
`(lambda_1)/(lambda_2) = mu/1`