Across
- 3. wide stream of light rays
- 4. light can pass through it but not clearly
- 6. light slowing and changing direction
- 7. used to see bones
- 9. maximum distance that a particle moves
- 12. bouncing off the surface of a substance
- 14. narrow beams of light
Down
- 1. a unit of measurment relative sound intensity
- 2. curved inwards
- 4. light can pass through it clearly
- 5. they carry energy and move
- 8. material through which a wave moves
- 10. invisible radiation emitted by warm things
- 11. one ..... is equal to one vibration ever second
- 13. curved outwards