An Optical Fiber Is 1 $\mu$ M Its Ends Are Perpendicular to Its Axis

Multiple Choice

An optical fiber is 1.00 meter long and has a diameter of 20.0 $\mu$ m. Its ends are perpendicular to its axis. Its index of refraction is 1.30. What is the minimum number of reflections a light ray entering one end will make before it emerges from the other end?

A) 2.85 × 10⁵
B) 2.56 × 10⁵
C) 2.42 × 10⁵
D) 1.85 × 10⁵
E) 2.02 × 10⁵