An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

A → spherical lens with two convex faces. The radii of curvature for the two surfaces may or may not be the same.

→ bi-; → convex; → lens.

A type of → convergent lens that is concave on one surface and convex on the opposite surface. Also called → meniscus lens. Meniscus lenses are used most often in conjunction with another lens to produce an optical system of a longer or shorter → focal length than the original lens.

→ concave; → convex; → lens.

Having a surface that is curved or rounded outward.

From M.Fr. convexe, from L. convexus "vaulted, arched," p.p. of convehere "to bring together," from → com- "together" + vehere "to bring" (cf. Skt. vah- "to carry, lead," vahitra "vehicle," Av. vazaiti "to lead," Mid.Pers. waz-, wazidan "to carry away," Gk. oxos "chariot," PIE base *wegh- "to go, carry, drive").

Kuž "humped," Mid.Pers. kôf "hill, mountain; hump" (Mod.Pers. kuh, "mountain"), kôfik "humpbacked," O.Pers. kaufa-, Av. kaofa- "mountain."

A lens that converges an incident beam of light to a focus.

→ convex; → lens.

A → spherical mirror with a reflecting surface curved outward, that is toward the object.

→ convex; → mirror.

A diverging lens having one surface convex and the opposite surface concave.

→ convex; → concave; → lens.

Describing a → lens which is → convex on both sides.

→ doubly; → convex.

A → convergent lens that has one flat side and one convex side. Plano-convex lenses focus parallel rays of light to a positive point, thus forming → real images.

→ plano-; → convex; → lens.