Waves review

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Across
  1. 1. length of wave from one crest to another
  2. 3. the point where all of the light is focused
  3. 4. highest frequency
  4. 9. highest point of wave
  5. 12. changes in speed of light/temperatures
  6. 13. return of a wave back to it's original medium
  7. 15. they burn you
  8. 16. thicker in middle than on sides
  9. 17. displacement longitudinal to wave direction
  10. 18. cancerous if overly exposed
Down
  1. 2. displacement perpendicular to wave direction
  2. 5. height of the wave
  3. 6. how often or quickly a wave passes by
  4. 7. slightly below red in terms of frequency
  5. 8. time taken to complete a cycle
  6. 10. lowest point of wave
  7. 11. Thinner in middle than on sides
  8. 14. 2 types of this: converging, diverging