Light ttave1ing downward is incident on a horizontal film of thickness t, as shown in Fig. 33.57. The incident ray splits into two rays, A and B. Ray A re8ects from the top of the film. Ray B re8ects from the bottom of the film and then refracts back into the material that is above the film. If the film has parallel faces, show that rays A and B end up parallel to eachother.

Transcribed Image Text:

Incident ray 71 12₂ 13 Film