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Across
  1. 2. layer of cells that line the inside of the eyeball
  2. 4. material that reflects or absorbs all of the light that strikes it
  3. 5. opening through which light enters the inside of the eye
  4. 6. transparent front surface of the eye
  5. 7. image seen in a plane mirror
  6. 9. gives eye its color
  7. 10. a material that transmits most of the light that strikes it
  8. 11. material that scatters the light that passes through it
  9. 12. colored substance
  10. 13. curved piece of glass that refracts light
  11. 15. forms enlarged images of tiny objects
  12. 16. copy of the object formed by reflected or refracted rays of light
  13. 17. mirror with a surface that curves outward
  14. 18. cells that respond to color
Down
  1. 1. image formed when lights rays actually meet
  2. 2. the index of ______ is a measure of how much a light ray bends when it enters a medium
  3. 3. objects in distance are blurry
  4. 5. three colors that can combine to form any other color
  5. 8. objects nearby are blurry
  6. 14. mirror with a surface that curves inward
  7. 15. image of a distant object caused by the refraction of light