In figure, the optical fiber is 
long and has a diameter of 
. If a ray of light is incident on one end of the fiber at angle 
, the number of reflection it makes before emerging from the other end is close to:
Text Solution
Verified by ExpertsA
If we approximate the angle 
as 
initially then answer will be closer to 57000 . but if we solve thoroughly, answer will be close to 55000 .
So both the answers must be awarded. Detailed solution as following.
Exact solution
By Snell's law 
Now 
Now number of reflections
Approximate solution
By Snell's law 1.sin 
If assume 
Now number of reflections
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