The light academy

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Across
  1. 1. a transparent optical element with flat and polished surfaces and it is mostly used to disperse light
  2. 3. the electromagnetic radiation within a certain portion of the electromagnetic spectrum
  3. 5. the maximum displacement of a particle of a medium from its rest position when a wave passes through it
  4. 10. lying or extending across or in a cross direction
  5. 11. a change in the observe frequency of a wave
  6. 12. the position of a point in time on a waveform cycle
  7. 14. the combination of two or more waves trains moving on intersecting or coincident paths
  8. 15. the line perpendicular to the boundary passing through the point of incidence
  9. 16. a space devoid of matter
  10. 17. a substance that makes possible the transfer of energy from one location to another, especially through waves
  11. 18. the repeated or regular way in which something happens or is done
Down
  1. 1. the time for a particle on a medium to make one complete vibrational cycle
  2. 2. a small breach on a surface
  3. 4. reflection of waves or particles from a surface such that the incident rays on the surface are scattered at many angles rather than at just one angle
  4. 6. a natural or artificial process that emits a visible electromagnetic radiation
  5. 7. the point on a wave with the greatest positive value or upward displacement within a cycle
  6. 8. the distance between two similar points on a wave of energy,such as light or sound
  7. 9. the number of complete vibrational cycles of a medium per a given amount of time
  8. 13. the change in direction of a wave passing from one medium to another,caused by its change in speed
  9. 18. the distance travelled by a wave in a specified context