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What Does a Fresnal Lens Do?

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What Does a Fresnal Lens Do?

Old 07-29-2007, 05:26 AM
  #1  
Spike
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Default What Does a Fresnal Lens Do?

What Does a Fresnal lens do? Does it detect heat/motion?
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Old 07-29-2007, 09:34 PM
  #2  
Nontypical Buck
 
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Default RE: What Does a Fresnal Lens Do?

I wish someone would tell us, been waiting for an answer!!
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Old 07-30-2007, 03:50 AM
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Spike
 
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Default RE: What Does a Fresnal Lens Do?

If we're talking about the same kind of Fresnel lens, it was used on lighthouses to concentrate the beam. They are actually made up of thousands of individual pieces of glass.
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