Across
- 4. dispersion of light
- 5. can't create its own light
- 8. electromagnetic waves
- 9. easily seen
- 10. light can produce this
- 12. used to measure brightness
- 14. unit of intensity at the retina
Down
- 1. light travels through this
- 2. property of light
- 3. not completely clear
- 6. entire range of light waves
- 7. transparent glass
- 11. impenetrable by light
- 12. partial shadow
- 13. study of light