1. Jan 4, 2013 #1

   David_woo

   

   Hello.
   
   I'm looking for a lens that can collimate (or focus far away >500mm ) a light coming out from a LED.
   
   before I give more details is this even possible?
   
   Thanks.

    

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   David_woo, Jan 4, 2013
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3. Jan 4, 2013 #2

   Integral

   

   Staff Emeritus

   Science Advisor

   Gold Member

   Take a pick, do you want it collimated or focused?

    

   Integral, Jan 4, 2013
4. Jan 4, 2013 #3

   David_woo

   

   if the focused focal is far away it doesn't matter, I just looking for divergent/convergent angle smaller to 1 degree.
   
   but if you want a pick lets said collimator.

    

   David_woo, Jan 4, 2013
5. Jan 4, 2013 #4

   Integral

   

   Staff Emeritus

   Science Advisor

   Gold Member

   A point source at the focal distance of a lens will produce a parallel beam out. So you want a 10-30mm focal length lens.
   
   You need the thin lens equation.

    

   Integral, Jan 4, 2013

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