
The Fresnel lens is an innovative optical lens designed to reduce the thickness and weight of conventional lenses while retaining their optical properties. Its structure and principle are characterised by the following features:
Organization:
Known as “Fresnel rings” or “Fresnel surfaces,” a Fresnel lens is made up of several concentric rings of optical surfaces. A piece of a traditional lens’s refractive surface is represented by each Fresnel ring. Fresnel lenses greatly reduce the thickness and weight of the lens by dividing its curvature into tiny, gradually changing rings. The lens appears lighter and slimmer due to its overall shape.

Principle:
The refraction of light is the basis for the Fresnel lens’s working principle. Parallel light beams are refracted on each ring surface as they go through a Fresnel lens, and eventually they are successfully brought together at a focal point. Each Fresnel ring can function as a miniature version of a traditional lens thanks to this design. Fresnel lenses may replicate the optics of a full lens while being smaller and lighter because to the careful calculation and arrangement of these rings.

Applications Of Fresnel lenses:
Fresnel lenses are widely used in lighthouses, projectors, optical instruments and solar concentrator systems. Their light weight and high optical efficiency make them very popular in many applications where space and weight need to be optimised.
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