Producing the perfect color images we need and love often requires multiple, heavy lenses so that each color focuses in exactly the same plane. Now engineers have developed a new theory that solves the problem using a single thin lens comprised of gradient index materials and metasurface layers to properly direct the light.

Via:: https://www.nanowerk.com/nanotechnology-news/newsid=49381.php

Metasurfaces enable improved optical lens performance

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