JEE Main 2019 — Physics solution

JEE Main2019Physics

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:

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

Solution

$\frac{1}{V} + \frac{1}{U} = - \frac{1}{40} \frac{V}{U} = - 5 - \frac{1}{5 U} + \frac{1}{U} = - \frac{1}{40} U = - 32 c m$

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