Across
- 1. : A group of parts that work together as a whole.
- 4. wave : A wave that is made when a line of matter is disturbed.
- 6. : To take in; when light hits an object but is not reflected or bent, it is absorbed.
- 7. : To bounce off a surface and move in a new direction.
- 10. : The property of letting almost all light through.
- 12. wave : A wave that is caused by a disturbance at a single point.
Down
- 2. : The property of letting some light through.
- 3. : To bend when entering a new medium.
- 5. light : Light such as sunlight that contains all the visible colours.
- 8. : A line of energy that continues in one direction until it hits an object.
- 9. : The property of letting no light through.
- 11. period : The amount of time it takes for a wave to complete one back-and-forth motion.