Posted by Blegh on Thursday, November 1, 2012 at 2:07pm.
(1/p) + (1/q) = 1/f
M = h'/h = -q/p,
Where p is distance of object from lens, q is distance of image from lens, f is focal length of the lens, and M is the magnification
f is positive when the lens is convex:
1/50 + 1/q = 1/15
q = 21.4 cm
M = -21.4/50
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