Across
- 1. region of darkness where no light can reach
- 4. no light passes through this object
- 7. it gives the direction that light travels
- 9. object does not give out light
- 10. the path along which light travels
- 11. partial shadow formed by an extended source
- 13. some light passes through this object
- 14. light bounces off the object
Down
- 2. beam where rays spread out from a point
- 3. object that gives out its own light
- 5. beam where rays meet at a point
- 6. shadow formed by a point source
- 8. object allows all light to pass through
- 12. a collection of rays