A narrow beam of sodium yellow light, with wavelength 589 nm in vacuum, is incident from air onto a smooth water surface at an angle of incidence of 40 degrees with respect to the normal. The index of refraction of water is 1.33. What is the angle of refraction in degrees

28.9°

Explanation:

Parameters given:

Angle of incidence, i = 40°

Refractive index, n = 1.33

Refractive index is the ratio of the sine of the angle of incidence, i, and the sine of the angle of refraction, r :

Therefore:

=>

r = 28.9°

The angle of refraction is 28.9°.

i would think it's food chain