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enderle ch. 30 voc.
science ch. 30 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 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
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