Physics Terms

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Across
  1. 3. a blue-green colour made by adding blue and green light
  2. 6. a tool for measuring angles
  3. 9. a collection of stars with their planets, dust and gas
  4. 11. separating white light into its component
  5. 14. word to describe a galaxy, having no clearly defined shape
  6. 16. a change in direction of light caused by a change in the speed of light passing through different medium
  7. 19. when light bounces off a surface without being absorbed
  8. 20. a pink colour made by adding red and blue light
  9. 21. the continuous range of colours in white light
Down
  1. 1. bowl-shaped dents on the surface of planets or moon caused by colliding objects
  2. 2. changed to become unclear
  3. 4. rocky objects, smaller than planets, that orbit the sun
  4. 5. describing a shape with three straight sides
  5. 7. to allow light to pass through
  6. 8. a 3D shape with a constant cross-section
  7. 10. in a ray diagram. this is a line drawn at 90° to a surface from which the angles of light rays are measured
  8. 12. a shape with curved arms extending out from its centre
  9. 13. the substance through which a light travels
  10. 15. all of space and everything contained in it
  11. 17. at 90°
  12. 18. a piece of glass designed to refract light