In figure, the optical fiber is l=2 m long and has a diameter of d =20\mu m. If a ray of light is incident on one end of the fiber at angle \theta_1 =40^\circ, the number of reflections it makes before emerging from the other end is close to : (refractive index of fiber is 1.31 and \sin 40^\circ=0.64 ) [8 Apr 2019 Shift 1]

JEE Main 8 Apr 2019 Paper 1 Solved Paper

Section: Physics

Question : 24 of 90

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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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