Light

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Across
  1. 2. invisible 90degree line
  2. 3. shadow with sharp edges
  3. 5. colours of visible light
  4. 7. fading shadow
  5. 8. refraction is due to a difference in speed in the light
  6. 10. extended source of light, natural
  7. 11. 300 000 000 m/s (3 words)
  8. 12. wood is an ____ material.
  9. 13. air is a ____ medium
  10. 16. prism experimenter
  11. 17. eclipse that occurs at night.
  12. 19. type of reflection that scatters light
  13. 20. type of light that human eyes can see
  14. 21. when light slows down it bends ___ the normal.
Down
  1. 1. angle of ____ =angle of reflection
  2. 4. bouncing of light
  3. 6. frosted glass is ____.
  4. 9. SME (2 words)
  5. 13. ___ materials scatter some light
  6. 14. a __ is formed when light is shone on an opaque object
  7. 15. shows direction of a light ray
  8. 18. change in direction of light as it moves from one transparent medium to the other
  9. 19. splitting up of light