An optical fiber with index of refraction n and diameter d is surrounded by air. Light is sent into the fiber along its axis, as shown in figure.
(a) Find the smallest outside radius R permitted for a bend in the fiber if no light is to escape.
(b) Does the result for part (a) predict reasonable behavior as d approaches zero? As n increases? As n approaches unity?
(c) Evaluate R, assuming that the diameter of the fiber is 100 µm and its index of refraction is1.40.

Transcribed Image Text:

111