A short straight object of height 100 cm lies before the central axis… | JEE Main 2021 (26 Feb, Shift 1)

Q35JEE Main 2021 · 26 FEB · SHIFT 1Medium

Reflection & Mirrors

A short straight object of height 100 cm lies before the central axis of a spherical mirror whose focal length has absolute value | f | = 40 cm. The image of object produced by the mirror is of height 25 cm and has the same orientation of the object. One may conclude from the information:

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Answer: (b)

Image is erect (same orientation) and diminished: $m = +\frac{25}{100} = +\frac{1}{4}$ .
An erect, diminished image is formed only by a convex mirror, and an erect image from a single mirror is always virtual.
A virtual image of a mirror lies behind it, i.e. on the opposite side to the object.
So the answer is (b).

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Reflection & Mirrors question from JEE Main 2021 (26 Feb, Shift 1)

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