Question

what is meant by paraxial rays​

Answer 1

Answer:

A paraxial ray is a ray which makes a small angle (θ) to the optical axis of the system, and lies close to the axis throughout the system.

Explanation:

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Answer 2

Answer:

A paraxial ray is a ray which makes a small angle (θ) to the optical axis of the system, and lies close to the axis throughout the system.

The commonly used optical expressions like the lens equation are approximations which are only valid for light rays close to the optic axis for which the approximation sinθ ≈ θ is valid. Such rays are called 'paraxial rays'.