Fr.: lentille biconvexe
A → spherical lens with two convex faces. The radii of curvature for the two surfaces may or may not be the same.
adasi-ye kâv-kuž (#)
Fr.: lentille concavo-convexe
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.
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."
adasi-ye kuž (#)
Fr.: lentille convexe
A lens that converges an incident beam of light to a focus.
→ convex; → lens.
Âyene-ye kâv (#)
Fr.: miroir convexe
A → spherical mirror with a reflecting surface curved outward, that is toward the object.
Fr.: lentille convexo-concave
A diverging lens having one surface convex and the opposite surface concave.
Describing a → lens which is → convex on both sides.
adasi-ye taxt-kuž (#)
Fr.: lentille plano-convexe
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.