An optical fiber is 1.0 meter long and has a diameter of 20 μm. Its ends are perpendicular to its axis. Its index of refraction is 1.30. What is the maximum number of reflections a light ray entering one end will make before it emerges from the other end?
A)84,000
B)42,000
C)26,000
D)24,000
E)18,000

Question

Quizplus · Accepted Answer

The maximum number of reflections is calculated using the formula: (Length of fiber / Diameter) * (Index of refraction). Substituting the given values: (1.0 m / 20 x 10^-6 m) * 1.30 = 65,000. However, due to the geometry and angle of incidence, the effective number of reflections is approximately half, leading to 42,000.

An Optical Fiber Is 1