Note: Of spherical lenses, there are six varieties, as shown in section in the figures herewith given: viz., a plano-concave; b double-concave; c plano-convex; d double-convex; converging concavo- convex, or converging meniscus; f diverging concavo-convex, or diverging meniscus. Crossed lens (Opt.), a double-convex lens with one radius equal to six times the other. — Crystalline lens. (Anat.) See Eye. — Fresnel lens (Opt.), a compound lens formed by placing around a central convex lens rings of glass so curved as to have the same focus; used, especially in lighthouses, for concentrating light in a particular direction; — so called from the inventor. — Multiplying lens or glass (Opt.), a lens one side of which is plane and the other convex, but made up of a number of plane faces inclined to one another, each of which presents a separate image of the object viewed through it, so that the object is, as it were, multiplied. — Polyzonal lens. See Polyzonal.
LENT
Lent,
Defn: imp. & p. p. of Lend.
LENT Lent, n. Etym: [OE. lente, lenten, leynte, AS. lengten, lencten, spring, lent, akin to D. lente, OHG. lenzin, langiz, G. lenz, and perh. fr. AS. lang long, E. long, because at this season of the year the days lengthen.] (Eccl.)
Defn: A fast of forty days, beginning with Ash Wednesday and continuing till Easter, observed by some Christian churches as commemorative of the fast of our Savior.
LENT
Lent, a. Etym: [L. lentus; akin to lenis soft, mild: cf. F. lent. See
Lenient.]
1. Slow; mild; gentle; as, lenter heats. [Obs.] B.Jonson.
2. (Mus.)
Defn: See Lento.
LENTAMENTE
Len`ta*men"te; adv. Etym: [It.] (Mus.)