Light, Mirrors, Lenses and the Eye Quiz

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Across
  1. 2. A type of mirror that is curved outward on at least one side so its middle is thicker than its edges, bending light towards a focal point
  2. 4. A type of mirror that has a flat reflecting surface
  3. 7. A wave that changes direction as it travels from one material to another
  4. 8. Two words, cells that are sensitive to low-light levels
  5. 10. A type of mirror that is curved inward
  6. 11. Allows almost all to pass through and forms a clear image
  7. 13. Two words, longest wavelength, lowest frequency, longer than 30cm
  8. 14. Does not allow light to pass through
  9. 15. Any reflecting surface that forms and image by regular reflection
  10. 17. Two words, a narrow beam of light that travels in a straight line
  11. 18. Two words, anything that emits light
  12. 19. Two words, black light, higher energy levels make them harmful to living things
  13. 20. A type of mirror that is curved inward on at least one side so its edges are thicker than its middle, bending light outwards
  14. 21. Two words, shorter than microwaves but longer than visible light, all vibrating particles emit these
Down
  1. 1. Two words, cells that enable the observation of color
  2. 3. Two words, ROYGBIV
  3. 5. A transparent object with at least one curved side that causes light to change direction
  4. 6. Allows most light to pass through but forms a blurry image
  5. 9. Occurs when light waves traveling in one direction are made to travel in many directions
  6. 10. A type of mirror that is curved outward
  7. 12. An opening into the interior of the eye at the center of the iris
  8. 13. A layer of special light-sensitive cells in the back of the eye
  9. 16. The colored part of an eye