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# Ch. 30 Physics Vocab

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 known as a convex lens.
Diverging Lens A lens that is thinest in the middle and that causes parallel rays of light to meet in the middle. Also known as a concave lens.
Concave lens A lens that is thinnest in the middle and that causes parallel rays of light to diverge. Also known 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 paralle; 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 perpendicular 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 appears to
Focal Plane come from a point on a focal plane.
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 by reflection or refraction that can be seen by an observer but cannot be projected onto a screen because light from the object does not actually come to a focus.
Ray Diagram A diagram showing rays that can be drawn to determine the size and location of an image formed by a mirror or lens.
Eyepiece lens of a telescope closest to the eye. Enlarges the 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 which light passes. The iris regulates the amount of light entering the eye.
Pupil the opening in the eyeball through which 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 object because the eyeball is so short that images form behind the retina.
Nearsighted term applied to a person who can clearly see nearby objects but cannot clearly see far away objects. The eyeball is elongated so that images focus in front rather than on the retina.
Astigmatism a defect of the eye caused when the cornea is curved more in one direction than the other.
Aberration Distortion in an image produced by a lens.
Fovea a small pit or depression in a bone or other structure.
Blind Spot a small area on the retina that is insensitive to light due to the interruption, where the optic nerve joins the retina, of the normal pattern of light-sensitive rods and cones.
Accommodation the automatic adjustment by which the eye adapts itself to distinct vision at different distances.
Created by: 13_bbetlejewski

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