What is the minimum length of the mirror required to visualised the complete image of the body of a person of height H.
A
H2
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B
H3
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C
3H
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D
Cannotbefound
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Solution
The correct option is AH2 The person must have to obtain a reflected ray one from his head and another reflected ray from the feet. Geometrically, AC = AB + BC where AB=x2 and BC=H−x2 ⇒AC=x2+H−x2 ⇒AC=H2 i.e. length of the mirror is just half the height of person.