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ch 30 vocab #1-25
chapter 30 vocabulary #1-12 and #13-25
| Question | Answer |
|---|---|
| lens | a piece of glass (or other transarent material) that can bend parallel rays of light so 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. |
| convex lens | a lens that is thickest in the middle, causing parallelrays of light to converge or focus. Also known as a converging lens. |
| diverging lens | A lens that is thinnest in the middle and that causes parallel rays of light to diverge. 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 jioning the centers of curvature of the surface of a lens. |
| focal point | for a converging lens, the point at which a beam of light pararllel to the principal axis converges. For a diverging lens, the point from which such a beam appears to come. |
| focal plane | converging lens: any incident parallel beam of light converges to a point somewhere on a focal plane.diverging lens: such a beam appears to 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 through reflection or refraction that can be seen by an observer but cannot be projected on a screen because the 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 real image formed by the first lens. |
| objective lens | in an optical deviceusing 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 applies to a person who has trouble focusing on nearby objects because the eyeball is so short that images form behind the retina. |
| nearsighted | term applies to a person who can clearly see nearby objects but not clearly see distant objects. the eyeball is elongated so that images focus in front of rather than on the retina |
| astigmatism | a defect of the eye caused when the cornea is curved more in one direction than in another. |
| aberration | distortion in an image produced by a lens. |
| fovea | the center of sharpest vision on the retina |
| blind spot | the spot on the eye where the optic nerve takes blood in and out of the eye, and information to the brain. |
| accomodation | when the ciliary nerve squeezes the lens in the eye to accomodate for distance changes. |
Created by:
imgirl13
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