Light and Optics

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Across
  1. 1. the distance between 2 crests
  2. 5. not capable of producing light
  3. 8. a system that uses waves of energy to sense objects
  4. 14. a magnifying glass with curved sides
  5. 16. the angle between the normal and the ray of light
  6. 17. matter that does not allow any light through is_____
  7. 18. the number of waves that pass a fixed point in unit time
  8. 19. matter that allows light to pass through is _____
Down
  1. 2. able to produce its own light
  2. 3. if a parallel beam of light hits a smooth surface the light reflected will also be parallel
  3. 4. living things that produce light have ____
  4. 6. the perpendicular dotted line that is drawn to the reflecting surface
  5. 7. no matter which direction light hits a smooth surface it reflects off at an equal angle
  6. 9. used to make distant objects appear near, often at night
  7. 10. a synthetic florescent or phosphorent substance
  8. 11. a smooth surface that reflects light to form an image
  9. 12. matter that allows some light to pass through but not shapes is ____
  10. 13. the representation of the possible paths light can take
  11. 15. retilinear rays of light that strike a surface