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  4. A plano convex lens of (.f=20 cm.) is silvered at plane surface. New f will be

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Q. A plano convex lens of $\left(\right.f=20 \, cm\left.\right)$ is silvered at plane surface. New $f$ will be

NTA AbhyasNTA Abhyas 2020Ray Optics and Optical Instruments

Solution:

$\frac{1}{ F }=\frac{2}{ f _{1}}+\frac{1}{ f _{ m }} \Rightarrow \frac{1}{ F }=\frac{2}{20}+\frac{1}{\infty} \Rightarrow F =10 cm$