In Fig. 33-58, light from ray A refracts from material 1 (n1 = 1.60) into a thin layer of material 2 (n2 = 1.80), crosses that layer, and is then incident at the critical angle on the interface between materials 2 and 3 (n2= 130), (a) What is the value of incident angle θA? (b) If θA is decreased, does part of the light refract into material 3?
Figure 33-58 Problem 60.
Light from ray B refracts from material l into the thin layer, crosses that layer, and is then incident at the critical angle on the interface between materials 2 and 3. (c) What is the value of incident angle θB? (d) If θB is decreased, does part of the light refract into material 3?
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