The wavelength and frequency of beam of light in water of R.I. 4/3 having wavelength 0.48 micron in air are

Options

A. `0.16 xx 10^(-6) m, 6.25 xx 10^(14) Hz`
B. `0.36 xx 10^(-6) m, 6.25 xx 10^(14) Hz`
C. `0.36 xx 10^(-6) m, 3.25 xx 10^(14) Hz`
D. `0.26 xx 10^(-6) m, 6.25 xx 10^(14) Hz`

Answer

B

Explanation

`lambda_(w) = (lambda_(a))/(mu) = (0.48)/(4//3) = (0.48 xx 3)/(4) = 0.36 mu m`
`n = (v_(a))/(lambda_(a)) = (3 xx 10^(8))/(0.48 xx 10^(-6)) = 6.25 xx 10^(14) Hz`