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JEE Main 2020 (8 Jan, Shift 2) · Reflection & Mirrors

Reflection & Mirrors question from JEE Main 2020 (8 Jan, Shift 2)

Q39JEE Main 2020 · 8 JAN · SHIFT 2Medium

Reflection & Mirrors

An object is gradually moving away from the focal point of a concave mirror along the axis of the mirror. The graphical representation of the magnitude of linear magnification (m) versus distance of the object from the mirror (x) is correctly given by:

(Graphs are drawn schematically and are not to scale)

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Answer: (c)

Concave mirror, object at distance $x > f$ : $|m| = \frac{f}{x - f}$
Just beyond F, $|m| \to \infty$ ; at $x = 2f$ , $|m| = 1$ ; as $x \to \infty$ , $|m| \to 0$ .
The graph starts very high just after $f$ , passes through $m = 1$ at $2f$ and keeps falling.
So the answer is (c).

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