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![[Post New]](/templates/default/images/icon_minipost_new.gif) 24 Feb 2008 15:01:09 IST
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An equiconvex lens with radii of curvature of magnitude r each is put over a liquid layer poured on top of a plane mirror. A small needle with its tip on the principle axis of the lens is moved along the axis until its inverted real image concides with the needle itself. The distance of the needle from the lens is measured to be 'a'. On removing the liquid layer and repeating the experiment the distance is found to be 'b'.
Given that two values of distances measured represent the focal length values in the two cases, obtain a formula for the refractive index of the liquid.
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