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enderle ch. 30 voc.

science ch. 30 vocab

QuestionAnswer
lens a piece of glass or other transparent material that can bend parallel rays of light so that they cross or appear to cross, at a single point.
converging lens a lens that is thickest in the middle, causing parallel rays of light to converge to a focus. also know as a convex lens
convex lens a lens that is thickest in the middle, causing parallel rays of light to converge to a focus. also know as a converging lens.
diverging lens a lens that is thinnest in the middle and that causes parrallel rays of light to diverge. also know as a concave lens.
concave lens a lens that is thinnest in the middle and that causes parrallel rays of light t odiverge. also know as a diverging lens.
principal axis the line joining the centers of curvature of the surfaces of a lens.
focal point for a converging lens the point at which a beam of light parrallel to the principal axis converges. for a diverging lens, the point from which such a beam appears to come.
focal plane a plane passing through either focal point of a lens that is perpandicular to the pirncipal axis.
focal length the distance between the center of a lens and either focal point
real image an image that is formed by converging light rays and that can be displayed on a screen.
virtual image an image formed throgh refraction that can be seen by an observer but cannot be projected on a screen beacuse light from the object does not actually come to focus.
ray diagram a diagram showing rays that can to be drwan to determain the size and location of an image formed by a mirror or lens.
eye piece lens of a telescope closest to the eye; enlarges the real image formed by the first lens
objective lens in an optical device using compound lenses, the lens closest to the object observed.
cornea the transparent covering over the eyeball
iris the colored part of the eye that surrounds the black opening through wich light passes. the iris regulates the amount of light entering the eye.
pupil the opening in the eyeball through wich light passes.
retina the layer of light-sensitive tissue at the back of the eye.
farsighted term applied to a person who has trouble focusing on nearby objects because the eyebal is so short that images form behind the retina.
nearsighted term applied to a person who can clearly see nearby objects but not clearly distant objects. the eyeball is elongated so that images focus in front rather than on the retina.
astigmatism a defect ofthe eye caused when the cornea is curved more in one direction than the another.
aberrtion distortion in an image produced by a lens.
Created by: tenderle14