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    Re: Night Vision Scopes
    From: Bill B
    Date: 2005 Jul 11, 02:20 -0500

    > The obvious example is using a magnifying glass to burn holes in
    > the school desk on a sunny day...
    
    Which brings us back to refraction.  Or vandalism.  Can I focus a magnifying
    glass through an automotive windshield to burn holes in the dashboard of
    someone in my designated parking spot?  
    
    Or as amateur photographers learn when they set their focal-plane-shutter
    SLR's back-side down on a nearly-horizontal surface when the Sun is
    high--without a lens cap; a swell way to burn a hole through the shutter
    curtain.
    
    Bill
    
    
    

       
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