A beam of photons in air strikes a composite material consisting of a 1-cm-thick sheet of polyethylene and a 2-cm-thick sheet of soda-lime glass. The incident beam is 10° from the normal of the composite.

Determine the angle of the beam with respect to the normal of the composite as it
(a) Passes through the polyethylene;
(b) Passes through the glass; and
(c) Passes through air on the opposite side of the composite.
By what distance is the beam displaced from its original path when it emerges from the composite?