Light

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Across
  1. 2. / something, such as an intermediate course of action, that occupies a position or represents a condition midway between extremes.
  2. 4. / number of occurrences per unit time.
  3. 5. / electromagnetic radiation with wavelengths between 400 and 700 nm that is visible.
  4. 7. / change in direction of light ray when passing one medium to another.
  5. 8. / single disturbance moving through a medium or field.
  6. 9. / a discrete particle, such as a photon or an electron.
  7. 11. / non-material property capable of causing changes in matter.
  8. 12. / the property of matter and electromagnetic radiation that is characterized by the fact that some properties can be explained best by wave theory and others by particle theory.
Down
  1. 1. / change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated.
  2. 3. / of or relating to the range of invisible radiation wavelengths from about 4 nanometers.
  3. 6. / of or relating to the range of invisible radiation wavelengths from about 750 nanometers.
  4. 10. / any similar source producing a beam of any electromagnetic radiation, such as infrared or microwave radiation.