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aplanatic

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aplanatic


  2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Aplanatic  \Ap`la*nat"ic\,  a.  [Gr.  'a  priv.  +  ?  disposed  to 
  wander,  wandering,  ?  to  wander.]  (Opt.) 
  Having  two  or  more  parts  of  different  curvatures,  so  combined 
  as  to  remove  spherical  aberration;  --  said  of  a  lens. 
 
  {Aplanatic  focus}  of  a  lens  (Opt.),  the  point  or  focus  from 
  which  rays  diverging  pass  the  lens  without  spherical 
  aberration.  In  certain  forms  of  lenses  there  are  two  such 
  foci;  and  it  is  by  taking  advantage  of  this  fact  that  the 
  best  aplanatic  object  glasses  of  microscopes  are 
  constructed. 
 
  From  WordNet  r  1.6  [wn]: 
 
  aplanatic 
  adj  :  (optics)  free  from  or  corrected  for  spherical  aberration; 
  "an  aplanatic  mirror" 




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