A beam of light is propagating through diamond (n1 = 2.42) and strikes a diamond-air interface at an angle of incidence of 28o.
(a) Will part of the beam enter the air (n2 = 1.00) or will the beam be totally reflected at the interface?
(b) Repeat part (a), assuming that the diamond is surrounded by water (n2 = 1.33) instead of air.