Question

Where should a person stand straight from the pole of a convex mirror of focal length $2.0$m on its axis so that the image formed become half of his original height?

• A. $-2.60$m
• B. $-4.0$m
• C. $-0.5$m
• D. $-2.0$m

Answer 1

Answer: (D)

$-2.0$m

Magnificationof the mirror is given as:

$m=\frac{f}{(f-u)}$

$+\frac{1}{2}=\frac{200}{(200-u)}$
$200-u=400$

$u=-200$cm

$u=-2$m.