an image formed by diverging light rays that is perceived by the brain,even though the light rays do not actually originate from the place where the image appears to be located

a reflective surface that curves inward and can magnify objects or create real images

imaginary straight line that is perpendicular to the surface at the center of a mirror or lens

the point on the optical axis of a curved mirror or lens where light rays that are initially parallel to the optical axis converge after striking the mirror or lens

distance from the center of a lens or mirror to the focal point

-an image that appears at a certain location as a result of rays of light converging at that location

-a reflective surface that curves outward,away from the viewer,and forms a reduced,upright,virtual image

a lens that is thicker in the middle than at the edges and can form real or virtual images

a lens that is thicker at the edges than in the middle,causes light rays to diverge and forms reduce,upright,virtual images;often used in combination with other lenses

transparent covering on the eyeball through which light enters the eye

-inner lining of the eye that has cells which convert light images into electric signals for interpretation by the brain

uses lenses to gather and focus light from distant objects

uses mirrors and lenses to collect and focus light from distance objects

-instrument that uses two convex lenses to magnify small,close objects