Answer :
Given: Magnification, m = -1
Distance of image, v= -40 cm
Magnification is written as:
u=-40 cm
Since object distance is equal to the image distance and the image formed is a real image, therefore the object is placed at centre of curvature of the mirror C.
When the object is moved 20 cm towards the mirror, then the new position of the image formed will be at focus of the mirror.
Applying the mirror formula:
Now in case 2nd, when f= -20 cm
Applying the mirror formula
The ray diagram is as follows:
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