In figure, the optical fiber is long and has a diameter of If ray of light is incident on one end of the fiber at angle the number of reflections it makes before emerging from the other end close to :
(refractive index of fiber is and )
Snells law for 1st surface
and
For T.I.R at 2nd surface
and
So
So T.I.R will happen
So
So
Option 4)
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