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NEET 2023 · Spherical Surfaces & Thin Lenses

Spherical Surfaces & Thin Lenses question from NEET 2023

Q60NEET 2023Medium

Spherical Surfaces & Thin Lenses

An object is mounted on a wall. Its image of equal size is to be obtained on a parallel wall with the help of a convex lens placed between these walls. The lens is kept at distance x in front of the second wall. The required focal length of the lens will be:

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Answer: (c)

Equal size real image means $|u| = v = 2f$ .
Lens to second wall is the image distance: $x = 2f$ .
$f = \frac{x}{2}$
So the answer is (c) $\frac{x}{2}$ .

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