A concave mirror used for face viewing has focal length of `0.4 m`. The distance at which you hold the mirror from your face in order to see your image upright with a magnification of 5 is ______ (in m).

Options

A. 0.16 m
B. 1.60 m
C. 0.24 m
D. 0.32 m

Answer

D

Explanation

Magnification for the concave mirror can be written as follows :
`m=(f)/(f-u)`
`rArr =(-40)/(-40-u)rArr u=-32cm`
We can see that option (d) is correct.