| A | B |
|---|
| light ray | a straight-line beam of light as it travels outward from its source |
| law of reflection | The angle between an incoming light ray and a surface equals the angle between the reflecged light ray and the surface |
| concave mirror | a mirror that curves in on the shiny side |
| convex mirror | a mirror that curves out on the shiny side |
| opaque | completely blocking light from passing through it |
| transparent | letting all light through, so that objects on the other side can be seen clearly |
| translucent | letting only some light through, so that objects on the other side appear blurry |
| refraction | the bending of light rays as they pass from one substance into another |
| convex lens | a lens that is thicker at the middle than at the edges. As it curves outward, it brings light together |
| prism | a cut piece of clear glass with two opposite sides in the shape of a triangle or other geometric shape. |
| spectrum | a band of color produced when light goes through a prism |
| concave lens | a lens that is thicker at the edges than at the middle. As it curves inward, it spread light rays apart |
| primary color | red, green, or blue. Mixing these colors can produce all the colors of the spectrum |
| electromagnestism | the production of magnestism by electricity |
| electromagnetic spectrum | all the wavelengths of visible and invisible light in order from short to long |
| laser | a device that produces a thin stream of light of just a few close wavelengths |
