Down
| 1. | A piece of clear material that is thinner in the middle and thicker around the edges. (2 words) |
| 2. | A piece of clear glass or plastic that bends light rays passing through it. |
| 4. | People who can see things close to them, but distant objects are blurry and difficult to see. |
| 5. | A part of the electromagnetic radiation that you can see with your eyes. (2 words) |
| 7. | The change in direction that occurs when a light ray bounces off of a surface. |
| 9. | A solid object that can bend or reflect light. |
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Across
| 3. | The bending of light rays as it passes from one material into another. |
| 6. | An invisible form of light that causes sunburn. (2 words) |
| 8. | A piece of clear material that is thicker in the middle than at the edges. (2 words) |
| 10. | People who have trouble seeing things that are close to them. |
| 11. | Empty space that contains no matter. Light can travel through this. |
| 12. | A type of energy that travels as a wave, but does not require a medium through which to travel. |
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