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A laser beam is introduced into an optical fiber, as shown in the figure. In order to ensure the beam to have
a total internal reflection inside the fiber, what is the maximum possible incident angle θ ?

A) 67.3 °
B) 56.8 °
C) 78.5 °
D) 47 °
E) 23.2 °

Air
n =1
Optical fiber
n=1.4

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