Solution:
The object should be placed from the lens on the left side and the magnification is .Given,
Distance of image from the lens,
Distance of the object from the lens,
Focal length of the lens,
By using the lens formula
Magnification,
A concave lens has a focal length of . At which distance should the object from the lens be placed so that it forms an image at from the lens? Also, find the magnification of the lens.