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Q.

In image formation from spherical mirrors, only paraxial rays are considered because they

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a

are easy to handle geometrically

b

contain most of the intensity of the incident light

c

form nearly a point image of a point source

d

show minimum dispersion effect

answer is C.

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Detailed Solution

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Paraxial rays are ones which originate from a point source and make a small angle with principle axis. After reflection, they give a point image, either real or virtual.

But if rays from point source that are far from the mirror axis, gives a blurred image, an effect called spherical aberration.

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