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

Correct Answer - D
(d) Given, m= + `1/2` , f= 2 m =200 cm, u = ?
`therefore` Magnification, `m=f/(f-u)`
`rArr+1/2=200/((200-u))`
`rArr 200-u=400rArru=-200 cm`
`rArr u=-2 m`