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Across
  1. 5. persistence of a sound due to multiple reflections
  2. 6. the change in direction of a wave as it crosses the boundary between two media in which the wave travels at different speeds
  3. 11. two colors of light beams that when added together appear white
  4. 13. a line perpendicular to a surface
  5. 15. the bouncing back of a particle or wave that strikes the boundary between to surfaces
  6. 17. a process in which sound or light is absorbed and reemitted in all directions
Down
  1. 1. a material that selectively absorbs colored light
  2. 2. the spread of radiation by frequency
  3. 3. light a mixture of all colors of the visible light spectrum
  4. 4. colors the colors of magenta, yellow, and cyan
  5. 7. red, blue, and green light; these colors when added together produce white light
  6. 8. the separation of light into colors arranged according to their frequency
  7. 9. angle between a reflected ray and the normal to a surface
  8. 10. the angle of incidence for a wave that strikes a surface is equal to the angle of reflection
  9. 12. angle between an incident ray and the normal to a surface
  10. 14. reflection the reflection of waves in many directions from a rough surface
  11. 16. a floating image that appears in the distance and is due to the refraction of light in Earth's atmosphere