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  4. A point object is placed as shown. The two pieces are of the same lens of focal length 10 cm . Find the distance (in cm ) between the two images formed by two pieces of the lens. <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/p-6mnbrcxiviazxpzn.jpg />

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Q. A point object is placed as shown. The two pieces are of the same lens of focal length $10\,cm$ . Find the distance (in $cm$ ) between the two images formed by two pieces of the lens.
Question

NTA AbhyasNTA Abhyas 2022

Solution:

The distance of image formed by each piece can be calculated by
$\frac{1}{f}=\frac{1}{v}-\frac{1}{u}$
$\frac{1}{10}=\frac{1}{v}-\frac{1}{- 15}$
$\Rightarrow v=30cm$
$\left|m\right|=\frac{30}{15}=2$
Solution