THE LIGHT ACADEMY

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Across
  1. 4. Named with the Greek letter φ
  2. 5. Phenomenon which occurs when a ray of light strikes a surface
  3. 6. Needed to have the phenomenon of diffraction
  4. 7. Property of a light wave determined by the frequency of the electromagnetic radiation
  5. 9. The property of waves which is defined as the distance between the peaks of two waves
  6. 11. The bending of a light ray when it passes from a medium to another one
  7. 13. Solid, liquid, gas or plasma... able to propagate energy waves
  8. 15. The "thing" that emits a light ray
  9. 16. Phenomenon which occur when a wave encounters an obstacle or a slit
  10. 18. The amount of energy carried by a wave
  11. 21. Its unit of measure is second and =1/f
Down
  1. 1. A surface associated with a propagating wave and passing through all points in the wave that have the same phase
  2. 2. It divides two mediums
  3. 3. The separation of electromagnetic radiation into constituents of different wavelength
  4. 8. index The speed of light in vacuum divided by the speed of light in the medium
  5. 10. Physical process where a radiation deviates from a straight trajectory because of the collision with an other particle
  6. 12. The imaginary line perpendicular to the surface reflecting the light
  7. 14. The object that reflects light
  8. 17. Has an inverse relationship to the wavelength λ (lambda)
  9. 19. Something that happens regularly and repeatedly
  10. 20. Lots of physicists (Newton, Huygens...) studied its real nature and found different answers