700 followers problem!

A man is standing at a distance \(5 \text{ m}\) from a plane mirror in front of him. He wants to see the entire wall in the mirror which is at a distance \(15 \text{ m}\) behind the man. Find the minimum size of the mirror, if the wall is \(10 \text{ m}\) high.

Clarification: Assume the man to be a point object.

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