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 `
`:. n=(C)/(V_L)=(3 xx 10^(8))/(2.25 xx 10^(8))=(4)/(3)`