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MHT CET 2021 (22 Sep, Shift 2) · Spherical Surfaces & Thin Lenses

Spherical Surfaces & Thin Lenses question from MHT CET 2021 (22 Sep, Shift 2)

Q80MHT CET 2021 · 22 SEP · SHIFT 2Medium

Spherical Surfaces & Thin Lenses

An object is located on a wall, its image of equal size is to be obtained on a parallel wall with the help of a convex lens. The lens is placed at a distance ' $d$ ' in front of the second wall. The required focal length of the lens is

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Answer: (d)

Equal size real image means $|u| = v = 2f$ .
Image distance is the lens-to-second-wall distance: $v = d = 2f$ .
$f = \frac{d}{2}$
So the answer is (d) only $\frac{d}{2}$ .

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