A virtual image three times the size of the object is obtained with a concave mirror of radius of curvature 36cm. The distance of the object from the mirror is
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a
5 cm
b
12 cm
c
10 cm
d
20 cm
answer is B.
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Detailed Solution
Image is virtual so m=+3. and f=R2=18cm So from m=ff−u⇒3=(−18)(−18)−u⇒u=−12cm.