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6 Written questions

5 Multiple choice questions

  1. are given off by people and police may use them to track criminals
  2. produce a thin beam of light that is only one color
  3. used to treat some kinds of cancer
  4. has a flat surface
  5. light bounces off this kind of surface in the opposite direction from which it came

5 True/False questions

  1. ultraviolet rayscause some material to glow and are used to find unsafe bacteria in food

          

  2. lensa piece of glass or other transparent object that refracts light and produces an image

          

  3. electromagnetic wavesused for radio and television broadcasting

          

  4. roughlight bounces off this kind of surface in the opposite direction from which it came

          

  5. microwavesused for radio and television broadcasting

          

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