In which of the following cases a light ray suffers the maximum deviation while passing through pole?

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Solution

The correct option is A
Thinner the lens i.e. (the central part of the lens), lesser is the deviation, as shown in the figure.

The centre of the lens is similar to a glass slab. The lens is made thin so that the deviation of light ray is negligible if it falls on the optical centre of the lens.

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What path does a ray of light travel when it suffers minimum deviation while passing through an equilateral prism?

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