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  4. A biconvex lens forms a real image of an object placed perpendicular to its principal axis. Suppose the radii of curvature of the lens tend to infinity. Then the image would

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Q. A biconvex lens forms a real image of an object placed perpendicular to its principal axis. Suppose the radii of curvature of the lens tend to infinity. Then the image would

Ray Optics and Optical Instruments

Solution:

$\frac{1}{f}=(\mu-1)\left(\frac{1}{R_{1}}-\frac{1}{R_{2}}\right)$
For biconvex lens $R_{2}=-R_{1}$
$\therefore \frac{1}{f}=(\mu-1)\left(\frac{2}{R}\right)$