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Which Rays Are Called Paraxial Rays?

Sophia Al-Mansoor • • 2 min read
Which Rays Are Called Paraxial Rays?

The commonly used optical expressions like the lens equation are approximations which are only valid for light rays close to the optic axis

optic axis
An optical axis is a line along which there is some degree of rotational symmetry in an optical system such as a camera lens, microscope or telescopic sight. The optical axis is an imaginary line that defines the path along which light propagates through the system, up to first approximation.
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for which the approximation sinθ ≈ θ is valid. Such rays are called 'paraxial rays'.

What is paraxial wave?

1 Dirac Notation of Paraxial Beams. As is well known, the paraxial wave equation (44) for a monochromatic beam is mathematically equivalent to the Schrödinger equation of a free quantum particle in two dimensions, where the propagation coordinate z replaces time.

What are paraxial rays and marginal rays?

Paraxial rays are nothing but a set of incident rays on the mirrors which lie very close to the principal axis. Whereas marginal rays are the set of incident rays of light on the mirror that hit the mirror towards its edges with respect to the pole of the mirror.

Sophia Al-Mansoor
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Sophia Al-Mansoor

Sophia analyzes international trade, startup ecosystems, retail transformation, and supply chain logistics for modern digital publications.