Wed January 26, 2011 By:

The distance between the object and real image is D. If the magnification is m, find the focal length .

Expert Reply
Wed January 26, 2011
Dear student,
M = 1/f
1/f = 1/D + 1/D
1/f = 2/D = M
f = 1/M = D/2
Hope this helps.
Thanking you
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