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JEE Main 2020 (5 Sep, Shift 1) · Spherical Surfaces & Thin Lenses

Spherical Surfaces & Thin Lenses question from JEE Main 2020 (5 Sep, Shift 1)

Q87JEE Main 2020 · 5 SEP · SHIFT 1Medium

Spherical Surfaces & Thin Lenses

For a concave lens of focal length f, the relation between object and image distances u and v, respectively, from its pole can best be represented by (u = v is the reference line):

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Answer: (d)

Concave lens: $|v| = \frac{|u| f}{|u| + f}$ , always less than $|u|$ and less than $f$ .
For small $|u|$ , $|v| \approx |u|$ , so the curve starts along the line $u = v$ .
As $|u| \to \infty$ , $|v| \to f$ , approaching the dotted line from below without crossing $u = v$ .
So the answer is (d).

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