Question

It is known that the velocity of light c and the wavelength λ are related to the frequency v by the formula c = λv.

Determine the change in the wavelength of a beam of red light as it passes from a vacuum into glass if the index of refraction of glass is 1.5 and the frequency corresponding to the red light is 4 x 1014/sec.

Answer 1

Answer: λ — X = 0.25 microns.

Explanation:

The wavelength of red light in a vacuum is λ = c/v; the velocity in glass is v = c/n. The wavelength of the red light in glass is λ1 = v/v. The change in the wavelength is