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In optics, a simple lens or singlet lens is a lens consisting of a single simple element. Typical examples include a magnifying glass or a lens in a pair of simple glasses. Operation of Simple Lens - University of Edinburgh
Simple lenses are prone to aberrations, especially chromatic aberration. They cannot be used for precise imaging and make poor . They are commonly used for laser applications, however, where the beams are both monochromatic (minimizing chromatic aberration) and narrow (minimizing spherical aberration).
Some with fixed lenses have been made using a simple lens, usually a meniscus lens with the convex face facing outward. In such examples the lens aperture is made small and in some cases (such as the Kodak Brownie 127 camera), the film plane is curved to reduce the impact of aberrations.
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