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By analogy a [[catadioptric system]] based on a [[wikt:convex|convex]] [[mirror]] is customarily called a ''lens'' when used in [[photography]], but not on a [[telescope]].
By analogy a [[catadioptric system]] based on a [[wikt:convex|convex]] [[mirror]] is customarily called a ''lens'' when used in [[photography]], but not on a [[telescope]].
{{catmore1|[[Lens (optics)]]}}
{{Cat main|Lens}}


[[Category:Optical devices]]
[[Category:Optical components]]

[[fr:Catégorie:Lentille]]
[[id:Kategori:Lensa]]
[[ko:분류:렌즈]]
[[pt:Categoria:Lentes]]
[[sk:Kategória:Šošovky]]
[[zh:Category:透镜]]

Latest revision as of 07:57, 7 September 2020

A simple lens is an optical element with perfect or approximate axial symmetry which transmits and refracts light, concentrating or diverging the beam. 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 is possible with a single element. Manufactured lenses are made of glass or transparent plastic. Elements which refract electromagnetic radiation outside the visual spectrum are also called lenses.

By analogy a catadioptric system based on a convex mirror is customarily called a lens when used in photography, but not on a telescope.