Question

an object is placed 40 cm from a concave mirror magnification produced is 1/2 where should object be placed to get magnification 1/3

Answer 1

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u=40 cm

m=1/2

$m \: = \frac{ - v}{u}$

1/2=-v/40

v=-20 cm

For getting mangnification 1/3,then

1/3=-20/U

U=-60 cm