| A | B |
|---|
| electromagnetic wave | does not need a medium in which to travel |
| medium | material in which a wave travels |
| concave lens | lens that is thicker at the edges than in the middle |
| refraction | beding of a light wave due to change in speed |
| law of reflection | angle of incidence is equal to the angle of reflection |
| focal length | distance along the optical axis from the center of a mirror |
| focal point | point through which all reflected light rays pass |
| convex lens | lens that is thicker in the center than at its edges |
| reflection | process of light striking an object & bouncing off |
| lens | transparent object with at least one curved side that causes light to bend |
| speed of light | 300 million m/s |
| primary colors of pigment | yellow, magenta, & cyan |
| primary colors of light | red, green & blue |
| light ray | narrow beam of light traveling in a straight line |
| microscope | combination of lenses used to magnify small objects |
| translucent | materials such as waxed paper & frosted glass |
| camera | uses convex lens to form an image on a medium |
| opaque | material such as wood & steel |
| telescope | used to examine very large objects that are far away |
| transparent | materials such as glass or clear plastic |
