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Define astigmatism?

Asked by 18th February 2011, 8:39 AM
Answered by Expert
Answer:
Dear student
 
It is a type of defect in a lens. Due to it the lines in some direction are focussed less sharply than lines in other dimnesions.
 
Hope this helps.
Regards
Team
Topperlearning 
Answered by Expert 18th February 2011, 10:21 AM
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