Optics

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Across
  1. 5. This reflection happens when light reflects on an ordinary object
  2. 6. cloudy
  3. 9. see through
  4. 10. High frequency waves have __________ wavelengths
  5. 14. Heat radiation
  6. 18. The distance from trough to trough
  7. 20. This reflection happens when light reflects on a shiny surface
  8. 21. This radiation has longest wavelength and lowest energy and frequency
  9. 22. the study of sight and the behaviour of light
  10. 24. Dispersion is when white light separates into _________ colours
Down
  1. 1. Radiation that we can see (2 words)
  2. 2. The height of a wave crest as measured from the rest postion
  3. 3. Light bends when it passes from one substance to another
  4. 4. doesn't let light come through it at all
  5. 7. Propagation through a vacuum means light travels through_________ space
  6. 8. Most dangerous for radiation (2 words)
  7. 11. When light hits something and bounces back
  8. 12. the first person to measure the speed of light
  9. 13. the speed is 300,000 km/s
  10. 15. light travels in a straight line
  11. 16. the first person to try to measure the speed of light
  12. 17. The unit of Frequency
  13. 19. used to photograph teeth and bones
  14. 23. Propagation through substances means light can travel through ________ substances, but not all