An object is placed $12\ cm$ to the left of a converging lens of focal length $8\ cm$. Another converging of $6\ cm$ focal length is placed at a distance of $30\ cm$ to the right of the first lens. The second lens will produce

Question

Dr. Abubacker · Accepted Answer

(c) For lens (1) $\frac{1}{f} = \frac{1}{v} - \frac{1}{u} \Rightarrow \frac{1}{( - 8)} = \frac{1}{v} - \frac{1}{( - 12)}$
$\Rightarrow v = 24\ cm\ i.e.$ image $A'B'$ is obtained $6\ cm$ before the lens 2 or at the focus of lens 2. Hence final image formed by lens 2 will be real enlarged and it is obtained at $\infty$

Q. An object is placed $12\ cm$ to the left of a converging lens of focal length $8\ cm$. Another converging of $6\ cm$ focal length is placed at a distance of $30\ cm$ to the right of the first lens. The second lens will produce

Explanation

Reviewed by Dr. Abubacker

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