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An object kept on the principal axis and...

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

A

`-1`

B

1

C

8

D

20

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The correct Answer is:
A
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