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Q.

A concave mirror gives an image three times as large as the object placed at a distance of 20cm from it. For the image to be real, the focal length should be

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a

10cm

b

15cm

c

20cm

d

30 cm

answer is B.

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Detailed Solution

m=ff−u⇒−3=ff−(−20)⇒f=−15cm

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