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JEE Main Physics Class 12 Ray Optics and Optical Instruments Part 1 Questions

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Question : 27

Total: 99

In figure, the optical fiber is l=2m long and has a diameter of d=20µm. If a ray of light is incident on one end of the fiber at angle θ1=40°, the number of reflections it makes before emerging from the other end is close to :
(refractive index of fiber is 1.31 and sin‌40°=0.64 )

[8 April 2019 I]

55000
66000
45000
57000

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