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# ch 30 vocabulary

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 the thickest in the middle,causing parallel rays of light to converge to a focus.
convex lens middle,causing parallel rays of light to converge to a focus.
diverging lens a lens that is the thinnest in the middle and that causes parallel rays of light to diverge
concave lens a lens that is the thinnest in the middle and that causes parallel rays of light to diverge
principal axis the line joining the centers of curature of the surfaces of a lens
focal point for converging lens the point at which a beam of light parallel 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 perpendicualr to the principal axis. for a converging lens, any incident parallel beam of light converges to a point somewhere on a focal plane. for a diverging lens, such a beam
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 through reflection or refraction that can be seen by an observer but cannot be projected on a screen because light from the object does not actually come to a focus
ray diagram a diagram showing rays that can drawn to determine the size and location of an image formed by a mirror or lens
Created by: 13_gseib
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