Three materials with n1 < n2 < n3 are arranged in layers of uniform thickness. A light ray in air enters the first layer at an angle of incidence of 30° and the ray eventually exits the third layer at the refracted angle ? in air. What is the value of ??
a. Some angle less than 30°.
b. 30°.
c. Some angle more than 30°.
d. Insufficient information to answer.
b
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