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Q.

An object kept on the principal axis and in front of a spherical mirror, is moved along the axis itself. If lateral magnification m is measured and plotted versus object distance |u| for a range of u, as shown fig. The magnitude of magnification of the object when it is placed at a distance 20cm in front of the mirror is

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Detailed Solution

When m = 2, u = –5cm

2=−v−5⇒v=10cm

1f=110+1−5⇒f=−10cm

Now when u = – 20 cm

−110=1v+1−20⇒v=−20cm

m=−−20−20=−1

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