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  • A convex lens A of focal length  and a concave lens B of focal length <img alt="5 \mathrm{~cm}" src="/latex-image/?5%

A convex lens A of focal length 20 \mathrm{~cm} and a concave lens B of focal length 5 \mathrm{~cm} are kept along the same axis with a distance d between them. If a parallel beam of light falling on. A leaves B as a parallel beam, then the distance d in cm will be:

Option: 1

25 \mathrm{~cm}


Option: 2

15 \mathrm{~cm}


Option: 3

10 \mathrm{~cm}


Option: 4

30 \mathrm{~cm}


Answers (1)

best_answer

\text { Here } f_{\text {eq }}=\infty

\mathrm{\Rightarrow \frac{1}{f_{e q}}=\frac{1}{f_{1}}+\frac{1}{f_{2}}-\frac{d}{f_{1} f_{2}}=0 }

\mathrm{\Rightarrow d=f_{1}+f_{2}}

\mathrm{\Rightarrow \mathrm{d}=15 \mathrm{~cm}}.

Posted by

Divya Prakash Singh

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