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In figure, the optical fiber is l = 2 m ...

In figure, the optical fiber is l = 2 m long and has a diameter of `d = 20 mum.` If a ray of light is incident on one end of the fiber at angle `theta_1=40^@` , the number of reflections it makes before emerging form the other end is close to : (refractive index of fiber is 1.31 and `sin40^@=0.64`)

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