| A | B |
| Light | A form of energy that travels in waves. |
| Electromagnetic Spectrum | Includes light you can and cannot see. |
| Visible Spectrum | Light you can see. |
| White Light | What is formed when visible colors are mixed. |
| Natural Light | Light that comes from the sun and other stars. |
| Artificial Light | Light that comes from light bulbs, and burning fossil fuels. |
| Florescent Lights | Lights in which electric current passes through a gas in a glass tube. |
| Laser | Light waves that travel in one direction and is made of only one wavelength that does not spread out. Used for surgery, to measure distance and to cut metal. |