Across
- 3. em waves used for radar cell phones and heat
- 6. em wave that makes sun tan or burn, and vitamin D in the skin
- 7. complete reflection of a ray of light in a medium
- 9. beam of light containing waves aligned in same direction
- 10. able to see through
- 13. wm waves with shortest wavelength and highest energy
- 15. between extremes of white and black
- 16. optical illusion caused by refraction of light
- 17. glowing material
- 18. an em wave used for long distance communication
- 20. reflecting little little light
Down
- 1. em wave passes through most solids
- 2. device emits visible light when an electric current passes through it
- 4. of higher frequency and shorter wavelengths than radio waves
- 5. particle of light
- 8. a wave that carries radiant energy
- 11. natural coloring matter
- 12. scattered light
- 14. unable to see through
- 19. reflect nearly all visible wavelengths