JEE MAIN - Physics (2019 - 9th April Morning Slot - No. 1)
A concave mirror 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 :
0.24 m
0.32 m
1.60 m
0.16 m
Explanation
$$m = {f \over {f - u}}$$
$$5 = {{ - 40} \over { - 40 - u}};\,u = - 32cm$$
$$5 = {{ - 40} \over { - 40 - u}};\,u = - 32cm$$
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