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Magnifying glass prism combo

  1. Aug 2, 2014 #1
    Can combining a magnifying glass and a prism make a rainbow capable of ignition?
  2. jcsd
  3. Aug 2, 2014 #2


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    Staff Emeritus
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    The magnifying glass would recombine the colors, at least to some extent, so you would probably have a white spot or stripe instead of a rainbow one. Also, to get the rainbow effect you must typically allow only a small strip of light into the prism, which would greatly reduce the amount of light available, possibly too low to ignite anything.
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