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Chapter 30 Vocab
| Question | Answer |
|---|---|
| A transparent material that can bend parallel rays of light so that they cross or appear to cross at one point. | Lens |
| A lens thick in the middle causing parallel rays to converge. | Converging Lens |
| Lens thick in the middle causing parallel rays to converge. | Convex Lens |
| Lens thin in the middle causing parallel rays to diverge. | Diverging Lens |
| Lens thin in the middle causing parallel rays to diverge. | Concave Lens |
| Line joining the centers of curvature of the surfaces of a lens. | Principal Axis |
| the point at which a beam of light parallel to the principal axis converges or appears to converge. | Focal Point |
| Plane perpendicular to the principal axis that passs through either focal point of a lens. | Focal Plane |
| Distance between the center of a lens and its focal point. | Focal Length |
| Image formed by converging light that can be displayed on a screen. | Real Image |
| Image that can be seen by an observer but can't be projected onto a screen because light from the object doesn't actaully come to a focus. | Virtual Image |
| Diagram showing rays that can be drawn to determine the size and location of an image formed by a mirror or lens. | Ray Diagram |
| Lens of a telescop closest to the eye; enlarges a real image formed by the first lens. | Eyepiece |
| In an optical device using compound lenses, and is the lens closest to the object observed | Objective Lens |
| Transparent covering over the eye | Cornea |
| Colored part of the eye surrounding the pupil. It regulates the amount of light entering the eye. | Iris |
| Opening in the eye through which light passes | Pupil |
| layer of light sensitive tissue at the back of the eye | Retina |
| A person who has trouble focusing on nearby objects because the images form behind the retina | Farsighted |
| A perosn who has trouble focusing on far away objects because the images form in front of the retina. | Nearsighted |
| Defect of the eye caused when the cornea is curved more in one direction than another. | Astigmatism |
| Distortion in an image produced by a lens | Aberration |
| Region in the center of our field of view where vision is sharpest. | Fovea |
| Spot in the retina where nerves carrying all th information leave the eye in a narrow bundle. | Blind Spot |
| The action of the ciliary muscles to change the shape of the lens so we can see near and far objects clearly. | Accommodation |
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