A light ray passes through the poles of all the four lenses given in the options individually. Through which lens will the deviation of the light ray from its original path be maximum?

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Solution

The correct option is D

The thinner the lens, i.e., (the central part of the lens) the less is the deviation, as shown in the figure.

As the centre of the lens is similar to a glass slab, the lens is made thin so that the light ray goes undeviated if it falls on the pole. So in a thicker lens, the deviation will be more.

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