Q. 353.5( 25 Votes )
Given: Magnification = 3
Distance of image from the lens = -80 cm
Now, Magnification m is given by
So, the object is to be placed at 26.67 cm from the lens.
The nature of the image is virtual, erect and larger than the object size.
Applying the lens formula:
F = 20 cm
Since focal length of the lens is positive, so the lens is convex lens.
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