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Question

An object is kept at a distance of 60cm from a concave mirror. For getting a magnification of 12, focal length of the concave mirror required is :

A
20cm
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B
40cm
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C
20cm
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D
30cm
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E
10cm
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Solution

The correct option is C 20cm
Given, Magnification, m=vu

12=v60

v=30cm

From lens formula, 1f=1v1u

1f=130+160

1f=2160=360

f=20cm

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