lenses Definition

to make a motion picture of : film

a piece of transparent material (such as glass) that has two opposite regular surfaces either both curved or one curved and the other plane and that is used either singly or combined in an optical instrument for forming an image by focusing rays of light

a combination of two or more simple lenses

a piece of glass or plastic used (as in safety goggles or sunglasses) to protect the eye

a lens made by combining lenses of different glasses having different focal powers so that the light emerging from the lens forms an image practically free of chromatic aberration

a thin lens designed to fit over the cornea and usually worn to correct defects in vision

a lens that causes parallel rays (as of light) to come to a focus

the lens of the eye in vertebrates

the lens nearest the eye in an eyepiece

the lens in a compound eyepiece that is nearer the objective

a lens that has a surface consisting of a concentric series of simple lens sections so that a thin lens with a short focal length and large diameter is possible and that is used especially for spotlights

a massive celestial object (such as a galaxy) that bends and focuses the light of another more distant object (such as a quasar) by gravity and that is usually detected by the multiple images it forms of the second object