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A concave mirror gives an image thre...

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-

A

10 cm

B

15 cm

C

20 cm

D

30 cm

Text Solution

Verified by Experts

The correct Answer is:
B
`1/f=1/u[1/m +1]`
m=3, u=20cm
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