Question

A person whose eyes are 1.50 m above the floor stands in front of a plane mirror. The top of his head is .10 m above his eyes. How far above the floor should the bottom edge of the shortest possible mirror be placed?

I know that I need to take half of a number. I just don't know if I need to take half of 1.50 or half of 1.60. Or if that's even right. HELP?!
eyes to mirror bottom to sole of shoe. They do not ask about top of mirror and top of head :)
1.6

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