Total Internal Reflection: An optic fiber is made of clear plastic with an index of refraction of 1.50. For what range of angles of incidence ? with the lateral surface of the fiber will light remain inside the plastic "guide" if it is surrounded by air?
A. 21.1° < ? < 90°
B. 23.4° < ? < 90°
C. 38.3° < ? < 90°
D. 40.3° < ? < 90°
E. 41.8° < ? < 90°
Answer: E
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