A boy $2 m$ tall stands at a distance $40 cm$ in front of a mirror. He sees an erect image $1 m$ high. The nature of mirror is

concave

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convex

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plane

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either convex or concave

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Solution

The correct option is B convex
Height of boy $= 2 m$
Height of image $= 1 m$
$\Rightarrow$ Image is diminished.
However the erect image is always a virtual and diminished in a convex mirror.
In case of plane mirror,
object size = image size

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2 m

40 cm

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A boy stands straight in front of a mirror at a distance of 30cm away from it.

He sees his erect image whose height is of his real height. The mirror he is using is

[MP PMT 1993]

No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be

(a) plane

(b) concave

(d) either plane or convex

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