During the Investigation of a New Type of Optical Fiber $n = 1.21 )$

question 152

Multiple Choice

During the investigation of a new type of optical fiber having an index of refraction $n = 1.21 )$ a laser beam is aimed at the flat end of a straight fiber, as shown in the figure. What is the maximum angle of incidence θ₁ if the beam is not to escape from the sides of the fiber if it is surrounded by air?

• A) 42.9°
• B) 39.8°
• C) 36.7°
• D) 33.6°
• E) 30.5°

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