MCAT Question A Day - 9/8/13 - Answer!
What is the magnification of a lens that forms an image 20 cm to its right when a real object is placed 10 cm to its left?
A. 0.50
B. 1.0
C. 1.5
D. 22.0
The correct answer is (D). Magnification is given by M = -q/p = -20 cm/10 cm = -2.0. The sign of q is positive because the image is real. The negative value of M means the image is inverted.
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