The graph in shows the variation of image distance (v) with object distance (u) in case of a lens. Find focal length of the lens. What is the nature of the lens, if image formed is real ? .
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As the image formed is real, the lens must be convex. From the graph, when `|u| = 20 cm, |v| = 20 cm` `:. u = -20cm, v = +20cm` `(1)/(f) = (1)/(v) - (1)/(u) = (1)/(20) + (1)/(20) = (1)/(10)` `f = 10 cm`
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