Across
- 2. a light source
- 5. a flat surface that can reflect light
- 9. ancient way to tell time using shadow
- 10. the process of bouncing light
- 11. formed when light is bent at a certain angle by water
- 12. some light can pass this material
- 14. light can not pass this material
- 15. seven different colors of visible light
Down
- 1. the amount of light
- 3. a black image
- 4. object that can separate visible light into 7 different colors
- 6. all light can pass this material
- 7. formed when light is blocked
- 8. tool to measure light intensity
- 10. the process of bending light
- 13. needed to see shadow