Chase's Crossword Puzzle

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Across
  1. 1. A transparent object with at least two nonparallel flat sides
  2. 4. The highest part of a wave
  3. 5. To change direction or bend form the original path
  4. 7. How bright an object appears (two words)
  5. 11. The bending of light as it passes from one medium into another
  6. 12. The study of light
  7. 13. Producing or emitting light
  8. 16. The lowest part of a wave
  9. 19. The passage of an object through the shadow of another object
  10. 20. Distance light travels in a years (two words)
Down
  1. 2. To change the direction of a wave when it bounces off a surface
  2. 3. The number of waves passing a point in a given time
  3. 6. The distance from one wave crest to the next
  4. 8. Partially shaded outer region of the shadow cast by an opaque object
  5. 9. Allowing light to pass through
  6. 10. Allowing light, but not detailed images, to pass through
  7. 14. Not allowing any light to pass
  8. 15. An area of darkness that forms behind an object when it blocks a light source
  9. 17. Fully shaded inner region of a shadow cast by an opaque object
  10. 18. The part of a lightbulb that releases heat and light when electricity passes through