Physics Crossword-Daphne A.

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Across
  1. 4. Law discovered in 1621 by Dutch Astronomer
  2. 6. Two or more light, sound, or electromagnetic waves of the same frequency combine to reinforce or cancel ea other
  3. 8. Lets light pass through and objects on other side are clear
  4. 10. Change in frequency or wavelength
  5. 13. Reflect light outwards
  6. 14. No light can pass through
  7. 15. Lets light pass through but objects on other side aren't clear
  8. 16. An angle
  9. 18. Transparent part of the eye
Down
  1. 1. Opaque spot on cornea
  2. 2. Where rays converge
  3. 3. Opening through which light travels
  4. 5. Reflect light inward
  5. 7. The bending of waves around an obstacle
  6. 9. Direction change of a wave
  7. 11. White layer of the eye
  8. 12. Direction change of a wavefront
  9. 17. Vascular layer of the eye