An optical fiber has index of refraction `n=1.40` and diameter `d=100 mu m`. It is surrounded by
Channel: Doubtnut
Date: 2020-01-28

An optical fiber has index of refraction `n=1.40` and diameter `d=100 mu m`. It is surrounded by air. Light is sent into the fiber along the axis as shown in figure. If smallest outside raidus R permitted for a bend in the fiber for no light to escape is given by 50 x (in `mu` m) fill value of x.