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Question

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

A
4 cm
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B
8 cm
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C
6 cm
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D
12 cm
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Solution

The correct option is A 4 cm
Given,
focal length, f=6cm

magnification, m=3

1) When magnification is positive: Image will be virtual

m=3

f=6cm (concave mirror)

We know,

m=ffu ......(1)

3=66u

u=4cm

2) When magnification is negative: image will be real

m=3

f=6

3=66u (from (1))

u=8cm

So, option A is correct

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