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  4. For a convex lens, if real image is formed the graph between (u+v) and u or v is as follows

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Q. For a convex lens, if real image is formed the graph between $(u+v)$ and $u$ or $v$ is as follows

Ray Optics and Optical Instruments

Solution:

For convex lens (for real image) $u+v \geq 4 f$
For $u=2 f, v$ is also equal to $2 f$
Hence $u+v=4 f$