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 15 cm further away with respect to the earlier position, and the magnification becomes `m_2`. If `m_1//m_2=4`, the focal length of the mirror is

10 cm

-30 cm

15 cm

-20 cm

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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.

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