Question

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

• 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 1

The correct option is C form nearly a point image of a point source

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 as spherical aberration.