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Ch. 30 Physics Vocab
| Question | Answer |
|---|---|
| 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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