2.4 Lens

Lens is an optical device with perfect or approximate axial symmetry which transmits and refracts light, converging or diverging the beam.


Figure 2.4.1: Two basic types of lenses – converging and diverging.

A simple lens consists of a single optical element. A compound lens is an array of simple lenses (elements) with a common axis. The use of multiple elements allows more optical aberrations to be corrected than it is possible with a single element. Lenses are typically made from glass or transparent plastic.

Figure 2.4.2: Different types of lenses used with LED light sources.

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