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The Lens Formula and Magnification

The lens formula is a relation between the focal length of the lens and the object and image distances from it. This relation is (for both convex and concave lenses)
 ------------- (10.8)
Height of the image (h’)
m = Height of the object (h) --------------- (10.9)
Also Magnification (m) =    ----------- (10.10)
U = the object distance
V = the image distance  All are measured from the optic centre of the lens
F = focal length of the lens
f = the focal length
h1 = the height of the object
h2 = the height of the image
m = the linear magnification, defined as the ratio of the height of the image to the height of the object.

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