Question

Refractive index of glass is 1.5. Find the wavelength of a beam of light with a frequency of 1014 Hz in glass. Assume velocity of light is 3 x 108 m/sec in vacuum.

Answer 1

n = 1.5 (refractive index of a glass)

$\nu$ = 1014Hz (frequancy)

c = 3 * 10⁸ $\frac{m}{s}$ (velocity of light) and $\lambda$ (wavelength)

$\lambda$ = $v * T = \frac{v}{\nu} = \frac{c}{n\nu} = \frac{3 * 10^8}{1.5*1014} =$ 197239m