Question

Monochromatic light of wavelength 589 nm is incident from air on a water surface. What are the wavelength, frequency and speed of
(a) reflected, and
(b) refracted light? Refractive index of water is 1.33.

Answer 1

^aμ_W = 1.33

λ_air = 589 nm = 589 x 10^-9

(a) For reflected light:- On reflection, no change occurs in wavelength, frequency and speed of the incident light.
Velocity of the reflected light = 3 x 10⁸ ms^-1
wavelength of the reflected light = 589 nm

The frequency is a inherent characteristic of radiation. It does not change on refraction.
∴ Frequency of the refracted light = 5.09 x 10¹⁴Hz.