A concave mirror gives an image three times as large as the object placed at a distance of 20 cm from it. For the image to be real, the focal length should be
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a
–10 cm
b
–15 cm
c
–20 cm
d
–30 cm
answer is B.
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Detailed Solution
Object distance, u = –20 cm , As image is real, thus , m = –3∵m=−vu⇒−3=−v−20⇒v=−60cm1f=1u+1v so f=-15 cm