Question

what is paraxial ray and peripheral rays????

Answer 1

The parallel rays which are away from the principal axis and not meet at the principal focus after reflection are called marginal rays. AND The parallel rays near to the principal axis and after reflection meet at the principal focus are called paraxial rays.

Peripheral rays interact with the edges of the components in an optical system. When a wavefront is spherically aberrated, peripheral rays focus closer to the lens than paraxial rays do rays do.

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Answer 2

Answer:

The paraxial approximation is a small-angle approximation used in Gaussian optics and ray tracing of light through an optical system. A paraxial ray is a ray that makes a small angle to the optical axis of the system and lies close to the axis throughout the system.

Peripheral rays interact with the edges of the components in an optical system. When a wavefront is spherically aberrated, peripheral rays focus closer to the lens than paraxial rays do.

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Explanation: