Light and Sound crossword puzzle part 1 (up to page 13)

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Across
  1. 2. What word has all the colors of the rainbow in one word?
  2. 4. The _____ nerve takes the signals from the retina and sends it to the brain.
  3. 5. When light ________ off a smooth surface you can see what on the smooth surface.
  4. 7. _______ mirrors are used on cars and trucks so they can see what's behind them.
  5. 9. What is the main source of light and energy?
  6. 10. When something is ______ it lets no light pass through it.
  7. 13. _______ mirrors can make items that are far away become bigger than they appear.
  8. 15. Mirrors in your house are ____ mirrors, ____ mirrors make a perfect reflection of you.
  9. 16. When an object reflects all the light what color is it?
  10. 17. What is the word that we use to measure sound and light waves?
  11. 19. What is the black part in the middle of the iris?
  12. 20. What part of the eye takes the light rays and turns them into signals?
  13. 22. What object takes light in and makes them into a beam of rainbow colors?
Down
  1. 1. What is the word that describes when all the light can pass through it?
  2. 3. spectrum What is the word that has all the colors of the rainbow?
  3. 6. What word describes when some light pass through an object?
  4. 8. What describes a plant's food?
  5. 11. When you put a pencil in water and it looks like it is bent, its called ________.
  6. 12. When an object absorbs all the light what color is it?
  7. 14. what is a curved piece of glass that also can bend light?
  8. 18. The _____ of light is the fastest thing on earth.
  9. 21. The ____ helps the pupil open and close.