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Practice MCAT Question - Q12 - 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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