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(i) Explain the working principle of an ...

(i) Explain the working principle of an optical fibre with the help of a diagram. Mention one use of a light pipe.
(ii) A ray of light is incident at an angle of `60^@` on one face of a prism with the prism angle A = `60^@`. The ray passes symmetrically through the prism. Find the angle of minimum deviation (`delta_m`) and refractive index of the material of the prism. If the prism is immersed in water, how will `delta_m`, be affected ?Justify your answer

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