Across
- 2. allows no light to pass through
- 4. electromagnetic ______
- 7. light is a form of ____
- 8. a beam of light that comes together at a point
- 10. 300 000 000 metres per second
- 11. light we can see
- 12. a material that allows all light to pass through it
Down
- 1. light can travel in a ____
- 3. a beam of light that travells straight
- 4. light travels in ___ lines
- 5. frosted glass is an example of ___ material
- 6. some materials allow some light to pass through them and ____ the rest
- 9. light does not need a ___ to travel in