Sound and Light

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Across
  1. 3. something that emits light
  2. 7. narrow beam of light that travels in a straight line
  3. 9. allows most light to pass through but forms a blurry image
  4. 10. colored part of the eye
  5. 11. reflected sound wave
  6. 15. allows almost all light to pass through and forms a clear image
Down
  1. 1. to change from one form into another
  2. 2. layer of light-sensitive cells in the back of the eye
  3. 4. longitudinal wave that can travel only through matter
  4. 5. any reflecting surface
  5. 6. transparent object with at least one curved side that causes light to change direction
  6. 7. a wave in which particles move in the same direction as the wave
  7. 8. opening to the interior of the eye through which light enters
  8. 12. transparent tissue layer located on the outside of the eye
  9. 13. material through which light does not pass
  10. 14. perception of how high or low sounds seem