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  4. The distance v of the real image formed by a convex lens is measured for various object distance u. A graph is plotted between v and u, which one of the following graphs is correct?

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Q. The distance $v$ of the real image formed by a convex lens is measured for various object distance $u$. A graph is plotted between $v$ and $u$, which one of the following graphs is correct?

Ray Optics and Optical Instruments

Solution:

For a lens $\frac{1}{f}=\frac{1}{v}-\frac{1}{u}$
If $u=\infty, v=f$ and if $u=f, v=\infty$
hence a rectangular parabola .