6.1 Crossword Puzzle

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Across
  1. 2. The transparent elastic structure by which light is focused onto the back of your eye
  2. 4. A reciprocal mirror that appears reflective on one side, and transparent on the other (when a light is shone on one side, it becomes a mirror)
  3. 6. To not let any light through
  4. 7. How we are able to see
  5. 11. Able to bounce off
  6. 12. To let most light through
  7. 15. The process to add a thick layer of smooth metal (making a mirror reflective) to the back of a piece of glass (making a mirror)
  8. 17. Refracts light and protects the eye
  9. 18. A small depression in the retina of the eye where visual acuity is highest
  10. 19. A layer at the back of your eye that contains cells that are sensitive to light and that trigger nerve impulses that pass to the brain, where a visual image is formed
  11. 21. A variable that will be observed or measured
Down
  1. 1. A variable that changes
  2. 3. The organ of tissue contained in the skull of vertebrates
  3. 5. The dark circular opening in the center of the iris of the eye, varying in size to regulate the amount of light reaching the retina
  4. 6. Sends nerve impulses to the brain for interpretation
  5. 8. The adjustable circular opening in the center of your eye
  6. 9. Also known as visual perception
  7. 10. To let some light through
  8. 13. Able to go through
  9. 14. A piece of glass with (typically) a silver coating on the back, painted behind with (typically) a black coating
  10. 16. To change direction (commonly light hitting an object, hence changing direction)
  11. 20. Typically a transparent or translucent piece of a hard, brittle substance
  12. 22. The pair of globular organs in the front of the head through which vertebrate animals see