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 ? .

The graph in shows the variation of image distance (v) with object dis

1.	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 ? .
Answer» As the image formed is real, the lens must be convex. From the graph, when `\|u\| = 20 cm, \|v\| = 20 cm` `:. u = -20 cm, v = + 20 cm` `(1)/(f) =(1)/(v)-(1)/(u)=(1)/(20)+(1)/(20) = (1)/(10)` `f = 10 cm`.

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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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