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

An object kept on the principal axis and in front of a spherical mirro

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