A person has eye level h above the floor. What is the height of the lower edge of the minimum vertical mirror needed to see the feet?
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Question

A person has eye level h above the floor. What is the height of the lower edge of the minimum vertical mirror needed to see the feet?

G1 Physics · Accepted Answer

The ray from the feet to the eye reflects at the midpoint in height between the feet (0) and eye (h), so the lower edge must reach h/2.