Optical Lens
These products serve projection, machine vision, surveillance, AR/VR, automotive imaging and medical instruments. Lenses are transparent spherical-surface optical elements; objectives combine several plastic/glass elements, with glass more expensive. Typical camera constructions include 1P, 2P, 1G1P, 1G2P, 2G2P and 4G; more elements raise cost. The source recommends glass for good cameras, claiming better imaging than plastic, with uses in astronomy, defense, transport, medicine and art. Applications also include security, vehicles, digital cameras, lasers and optical instruments. Refractive lenses use glass, crystal or other transparent materials with two spherical surfaces or one spherical/one flat surface, forming real or virtual images. Convex lenses are thick centrally/thin at edges: biconvex, plano-convex or concave-convex. Concave lenses are thin centrally/thick at edges: biconcave, plano-concave or convex-concave.
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