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Q.

Image formed by a concave mirror of focal length 6 cm, is 3 times of the object, then the distance of object from mirror is

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a

– 4 cm

b

8 cm

c

6 cm

d

12 cm

answer is A.

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Detailed Solution

m=±3 and f=−6cm  Now m=ff−u⇒±3=−6−6−u  For real image −3=−6−6−u⇒u=−8cm  For virtual image 3=−6−6−u⇒u=−4cm
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Image formed by a concave mirror of focal length 6 cm, is 3 times of the object, then the distance of object from mirror is