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collimator

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collimator


  2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Collimator  \Col"li*ma`tor\,  n. 
  1.  (Astron.)  A  telescope  arranged  and  used  to  determine 
  errors  of  collimation,  both  vertical  and  horizontal. 
  --Nichol. 
 
  2.  (Optics)  A  tube  having  a  convex  lens  at  one  end  and  at  the 
  other  a  small  opening  or  slit  which  is  at  the  principal 
  focus  of  the  lens,  used  for  producing  a  beam  of  parallel 
  rays;  also  a  lens  so  used 
 
  From  WordNet  r  1.6  [wn]: 
 
  collimator 
  n  1:  a  small  telescope  attached  to  a  large  telescope  to  use  in 
  setting  the  line  of  the  larger  one 
  2:  a  tube  containing  a  convex  achromatic  lens  at  one  end  and  a 
  slit  at  the  other  with  the  slit  at  the  focus  of  the  lens; 
  light  rays  leave  the  slit  as  a  parallel  beam 




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