A child 1.2 m tall stands on a 0.3 m high stool facing a plane mirror on a wall

PHYSICS · Single correct · CBSE · Physics · Light — Reflection and Refraction · Light — Reflection and Refraction

Problem

A child 1.2 m tall stands on a 0.3 m high stool facing a plane mirror on a wall. The child’s eyes are 0.1 m below the top of the head. What is the minimum height above the floor at which the bottom edge of the mirror must be placed so that the child can just see the feet while standing on the stool? (a) 0.75 m0.75\,\text{m} (b) 0.85 m0.85\,\text{m} (c) 0.65 m0.65\,\text{m} (d) 0.90 m0.90\,\text{m}

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