Aplanatic lens

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What Wikipedia says

An aplanatic lens is a lens that is free of both spherical and coma aberrations. Aplanatic lenses can be made by combining two or three lens elements. A single-element aplanatic lens is an aspheric lens whose surfaces are surfaces of revolution of a cartesian oval.

Excerpt from the Wikipedia article “Aplanatic lens”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Szőcs TamásTamasflex, CC BY-SA 3.0, via Wikimedia Commons.