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When an object is placed at a distance o...

When an object is placed at a distance of 25 cm from a mirror, the magnification is `m_(1)`. The object is moved 15cm farther away with respect to the earlier position, and the magnification becomes `m_(2)`. If `m_(1)//m_(2)=4` , then calculate the focal length of the mirror.

A

10cm

B

30cm

C

15cm

D

20cm

Text Solution

Verified by Experts

The correct Answer is:
D
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