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 ?₁ if the beam is not to escape from the sides of the fiber if it is surrounded by air?

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The Answer of 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 ?₁ if the beam is not to escape from the sides of the fiber if it is surrounded by air?

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

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