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B Lenses for laser

  1. Jun 20, 2017 #1
    I want to make a laser to burn paper so if i use 2 or 3 convex lenses with a laser will it be helpful . Or can i use 1convex then 1 concave and then 1convex to make it
  2. jcsd
  3. Jun 20, 2017 #2
    Why would you use a concave one?
  4. Jun 20, 2017 #3


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    Staff: Mentor

    Welcome to the PF. :smile:

    You should probably just stick with using sunlight and a magnifying glass. A laser with enough power to start burning a spot on paper would cost many thousands of dollars. If you are in university, you may be able to ask the appropriate physics professor for a tour of the laser lab...
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