A ray of light of vacuum wavelength 550 nm
traveling in air enters a slab of transparent
material. The incoming ray makes an angle of
31.5° with the normal, and the refracted ray
makes an angle of 21.6° with the normal.
Find the index of refraction of the trans-
parent material. (Assume that the index of
refraction of air for light of wavelength 550
nm is 1.00.)