Optics stuff and stuff else

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Across
  1. 2. Matter that allows some light to pass through
  2. 3. Used to transmit information from a remote control to a television
  3. 5. The science of light properties and behavior
  4. 6. Matter that does allow light to pass through
  5. 7. Matter That allows light to pass through
  6. 9. A wave with a specific pattern that carries information
  7. 10. The region where light is obstructed or blocked
  8. 12. Used to transmit television and radio programs
Down
  1. 1. a unique 3-signal combination of dashes and dots codes for each letters of the alphabet and numbers 0 to 9
  2. 4. Wave signals generated electronically from digital information
  3. 8. Wave signal not created by digital information
  4. 11. Used to transmit information between cellphones or between an internet router and a computer