(i) Explain why the refractive index of any material with respect to air is always greater 1.
(ii) In the figure below a light ray travels from air into the semi-circular plastic block. Give a reason why the ray does not deviate at the semi-circular boundary of the plastic block

(iii) Complete the ray diagram of the above scenario when the light ray comes out of the plastic block from the top flat end.

Solution

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