mac & cheese crossword puzzle

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Across
  1. 1. light bounces of a surface at a certain angle
  2. 5. requires a medium to travel through
  3. 9. far apart
  4. 12. height of a wave
  5. 15. carried by waves and can be transformed into light
  6. 16. light being absorbed and transformed into heat
  7. 18. lowest point of a transverse wave
Down
  1. 2. number of crests that pass per second
  2. 3. particles travel left to right
  3. 4. light bending as it begins to travel through a new medium
  4. 6. close together
  5. 7. lens that are thinner in the center and thicker at the edges
  6. 8. highest point of a transverse wave
  7. 10. distance from crest to crest or trough to trough
  8. 11. does not require a medium to travel
  9. 13. particles travel up and down
  10. 14. waves spreading out as they pass through an object
  11. 17. lens that are thicker in the center and thinner at the edges