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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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