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Question

A boy is $1.8 m$ tall and can see his image in a plane mirror fixed on a wall. His eyes are $1.6 m$ from the floor level. The minimum length of the mirror to see his full image is-

A

0.9 m

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B

0.85 m

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C

0.8 m

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D

Can't be determined

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Solution

The correct option is A $0.9 m$
Height of the boy, $H = 1.8$ m

Minimum length of the mirror, $h = \frac{H}{2} = \frac{1.8}{2} = 0.9$ m

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