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![[Post New]](/templates/default/images/icon_minipost_new.gif) 26 Feb 2008 14:14:09 IST
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when there is water below the lens it acts as a planoconvex lens and when the object coincides with the image it impies it is the focal length of the combination this can be understood frm the ray diagram...
and when there is no liq it wud b the focal length of the convex lens because of the presence of plane mirror......
u'll understand it by drawing the ray diagram.......
and from this the above follows
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