1. Light of wavelength 620nm in air is incident on a surface ofa flat piece of glass with an index of refraction of
1.50 with an angle of incidence of 30°.
a.What is the angle of refraction?
-Answer: 19.5°
b. Find the wavelength and frequency of light in glass.
Answer: 413nm, 4.84x1014Hz
c.Explain under what circumstances “total internal reflection”can be observed at the boundary between air
and this piece of glass. Be as specific as possible.
