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Difference between Convex and Concave Lens

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It is very useful.But i would like to say that the author should write the names of the disease which can be reduced or balanced by using these lenses.

Posted by VD on Sun, 03/15/2015 - 15:59

i have learned much more about the lenses thanks!

Posted by atchyut on Sat, 11/15/2014 - 11:48

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