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In the Figure,in the Investigation of a New Type of Optical

Question 21

Multiple Choice

In the figure,in the investigation of a new type of optical fiber (index of refraction n = 1.26) ,a laser beam is incident on the flat end of a straight fiber in air.What is the maximum angle of incidence θ<sub>1</sub> if the beam is not to escape from the fiber? A) 50.0° B) 46.9° C) 43.8° D) 40.7° E) 37.6° In the figure,in the investigation of a new type of optical fiber (index of refraction n = 1.26) ,a laser beam is incident on the flat end of a straight fiber in air.What is the maximum angle of incidence θ1 if the beam is not to escape from the fiber?


A) 50.0°
B) 46.9°
C) 43.8°
D) 40.7°
E) 37.6°

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