Question

Suppose a light starts travelling through an optical fibre which has refractive index equal to that of the refractive index of water. Eventually the light reaches
the end point of the fibre and exits into air.
(a) If the incidence angle () of the light at the end of the fibre is 30°, then what will be the angle of refraction (1) outside the fibre?
(b) What will be the variation if the incident angle is 60°?
(Note: Take sin-(0.665) = 41º, sin 2(0.719) = 46°, sin(0.682) = 43º, sin 20.669) = 42°, and sin 60° = 0.866)
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Answer 1

Answer:

The refractive index of the material used in the lens is the same as the water surrounding the lens OR

The light ray is entering and exiting the lens at right angle to the surface. This WI happen if the light ray is travelling through the principle axis of the lens.

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