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Size of Mirror

A beautiful g...

Question

A beautiful girl with two normal eyes wants to see full width of her face by a plane mirror. The eye to eye and ear to ear distance of her face are $4$ inch and $6$ inch respectively. The minimum width of the required mirror is:

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Solution

So length of mirror required
$l = 4 + 0.5 + 0 - 5 = 5 m$

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