Question

What is meant by 'paraxial approximation' ?

Answer 1

Explanation:

In geometric optics, the paraxial approximation is a small-angle approximation used in Gaussian optics and ray tracing of light through an optical system (such as a lens). The paraxial approximation is used in Gaussian tracing. Ray transfer matrix analysis is one method that uses the approximate.

Answer 2

Answer:

In geometric optics, 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 which makes a small angle to the optical axis of the system, and lies close to the axis throughout the system.