Answer
$0.25m$
Work Step by Step
We know that:
initial position of the mirror =$\frac{7.0m}{2}=0.35m$ below the eyes
Now, the final position of the mirror$=\frac{1.2m}{2}=0.6m$
Thus, the height of the stool is:
$0.6m-0.35m=0.25m$
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