Mom, How does a CD or DVD or Blu-ray Work? | Doc Physics

by: Doc Schuster     Published on: 12 March 2013

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We'll investigate the interference that causes signal changes in the light sensor of an optical storage drive.If you want to know WHY the blue (actually violet) light of Blu-ray can read a tighter bump density than the red lasers of CD's and DVD's, check dis out: http://www.youtube.com/watch?v=ef211FCxlfs