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Image Formation by a Point Object

A person 1....

Question

A person $1.6 m$ tall is standing at the centre between two walls three metre high. What is the minimum size of a plane mirror fixed on the wall in front of him, if he is to see the full height of the wall behind him?

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Solution

Since he is standing at the exact center the mirror should have minimum length of average of man's height and wall's height.
The mirror should have a minimum length $= \frac{1.6 + 3}{2} = 2.3$

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