A person has height H and eye level h above the floor. What is the height of the upper edge of the minimum mirror needed to see the top of the head?
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A person has height H and eye level h above the floor. What is the height of the upper edge of the minimum mirror needed to see the top of the head?

G1 Physics · Accepted Answer

The required reflection point for the top of the head lies midway in height between H and h, so the upper edge must reach (H+h)/2.