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.Multiplyinglens 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) imp. & p. p. of Lend.

(Lent), n. [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.) 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 lily(Bot.), the daffodil; — so named from its blossoming in spring.

(Lent), a. [L. lentus; akin to lenis soft, mild: cf. F. lent. See Lenient.]

1. Slow; mild; gentle; as, lenter heats. [Obs.] B. Jonson.

2. (Mus.) See Lento.

(Len"i*tive*ness), n. The quality of being lenitive.

(Len"i*tude) n. [L. lenitudo.] The quality or habit of being lenient; lenity. [Obs.] Blount.

(Len"i*ty) n. [L. lenitas, fr. lenis soft, mild: cf. OF. lenité. See Lenient.] The state or quality of being lenient; mildness of temper or disposition; gentleness of treatment; softness; tenderness; clemency; — opposed to severity and rigor.

His exceeding lenity disposes us to be somewhat too severe.

Syn. — Gentleness; kindness; tenderness; softness; humanity; clemency; mercy.

(Len`ni-Len*a"pe) (len`ni- len*ä"pa), n. pl. (Ethnol.) A general name for a group of Algonquin tribes which formerly occupied the coast region of North America from Connecticut to Virginia. They included the Mohicans, Delawares, Shawnees, and several other tribes.

(Le"no) n. [Cf. It. leno weak, flexible.] A light open cotton fabric used for window curtains.

(Le*noc"i*nant) a. [L. lenocinans, p. pr. of lenocinari to pander, cajole; akin to leno pimp.] Given to lewdness. [Obs.]

(Lens) n.; pl. Lenses [L. lens a lentil. So named from the resemblance in shape of a double convex lens to the seed of a lentil. Cf. Lentil.] (Opt.) A piece of glass, or other transparent substance, ground with two opposite regular surfaces, either both curved, or one curved and the other plane, and commonly used, either singly or combined, in optical instruments, for changing the direction of rays of light, and thus magnifying objects, or otherwise modifying vision. In practice, the curved surfaces are usually spherical, though rarely cylindrical, or of some other figure.


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; e converging concavo-convex, or converging meniscus; f diverging concavo-convex, or diverging meniscus.

  By PanEris using Melati.

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