Answer:
The correct answer will be "2 m".
Explanation:
As we know,
⇒  [tex]\frac{Mirror's \ size}{Body's \ height} =\frac{1}{2}[/tex]
Now,
⇒  [tex]Size \ of \ a \ mirror = \frac{n}{2}[/tex]
Then,
⇒  [tex]Size \ of \ mirror = \frac{4}{2}[/tex]
⇒               [tex]=2 \ meter[/tex]
