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A person is six feet tall. How tall must a vertical mirror be if he is able to see his entire length?

1. 3 ft
2. 4.5 ft
3. 7.5 ft
4. 6 ft

Correct answer: 3 ft

Solution

To see his entire height, the mirror needs to be at least half his height because the light from the top and bottom of his body reflects symmetrically. Thus, the mirror must be 3 ft tall.

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