(Answered) A man stands vertically in front of a mirror his eyes are

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A man stands vertically in front of a mirror. His eyes are 2.5 m above the floor, and the top of his head is 0.15 m higher. He wishes to know the height above the floor of the top and bottom of the smallest mirror in which he can see both the top of his head and his feet. What is the height above the floor of the bottom of the mirror?

The answer is 1.25 m, I want to know how to get the answer.

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