A ray of light of frequency `5 xx 10^(14)` Hz is passed through a liquid . The wavelength of light measured inside the liquid is found to be 450 nm . Calculate (i) wavelength of light in vacuum (ii) refractive index of liquid (iii) velocity of light in the liquid . Take velocity of light in vacuum as ` 3 xx 10^(8) ms^(-1)`

Options

A. 1.5
B. 1.33
C. 1.25
D. 1.8

Answer

B

Explanation

`V_(L) = v lambda = 5 xx 10^(14) xx 450 xx 10^(-9)`
`= 225 xx 10^(6) = 2.25 xx 10^(8) m//s`
`therefore n = (C)/(V_(L)) = (3 xx 10^(8))/(2.5 xx 10^(8)) = (4)/(3)`