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JEE Main 8 Apr 2019 Paper 1 Solved Paper

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Question : 24

Total: 90

In figure, the optical fiber is l=2 m 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 Apr 2019 Shift 1]

45000
55000
66000
57000

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