Examining the Refraction of Light in Prisms Questions 1.<Tab/>What is the relationship between the angle of incidence and the angle of refraction? The angle of incidence (formed by the ray of light travelling though air into a slab of rectangular perspex) is not directly proportional to the angle of refraction (angle formed between the ray travelling though perspex and the normal). The graph of the plotted angles of incidence against …showed first 75 words of 734 total…

…showed last 75 words of 734 total…the normal) which makes 42 the critical angle for perspex. ∞<Tab/>The angle of incidence is not directly proportional to the angle of refraction in perspex ∞<Tab/>Once the angle of incidence exceeds 42 (critical angle in perspex), total internal reflection occurs where the ray does not exit through the perspex. Instead, it is reflected at an angle equal to the initial angle of incidence.