Across
- 2. The transparent elastic structure by which light is focused onto the back of your eye
- 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)
- 6. To not let any light through
- 7. How we are able to see
- 11. Able to bounce off
- 12. To let most light through
- 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)
- 17. Refracts light and protects the eye
- 18. A small depression in the retina of the eye where visual acuity is highest
- 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
- 21. A variable that will be observed or measured
Down
- 1. A variable that changes
- 3. The organ of tissue contained in the skull of vertebrates
- 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
- 6. Sends nerve impulses to the brain for interpretation
- 8. The adjustable circular opening in the center of your eye
- 9. Also known as visual perception
- 10. To let some light through
- 13. Able to go through
- 14. A piece of glass with (typically) a silver coating on the back, painted behind with (typically) a black coating
- 16. To change direction (commonly light hitting an object, hence changing direction)
- 20. Typically a transparent or translucent piece of a hard, brittle substance
- 22. The pair of globular organs in the front of the head through which vertebrate animals see