Light and Matter

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Across
  1. 2. - the color part of the eye that can open or shut to let certain amounts of light into the eye
  2. 5. - light changing direction
  3. 7. - when light reflects in all directions
  4. 11. - a very thin layer of silver, aluminum, tin or nickel mixed into a clear piece of plastic
  5. 13. - go through
  6. 17. - the transparent covering of the eye that protects the front of it
  7. 18. variable - the variable that is changed on purpose
  8. 20. - area where light enters the eye
  9. 21. - an event that happens in nature that is hard to explain
Down
  1. 1. - causes the light that passes through it to focus to a point on the retina at the back of the eye
  2. 3. - bounce off
  3. 4. - a material that transmits most of the light that shines on it
  4. 6. - adding a metal, such as silver, to the back of a piece of glass.
  5. 8. - parts working together
  6. 9. nerve - passes electrical signals from the retina to the brain
  7. 10. - anything that has mass and takes up space
  8. 12. - a smaller representation of something
  9. 14. - area in back of the eye where light signals are changed to electrical signals
  10. 15. - something that can be changed or adapted
  11. 16. - a material that lets no light transmit through it
  12. 19. variable - the variable that changes because of the independent variable change