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A concave mirror (f = 10 cm) has an object 5 cm in front. What is the magnification?
A+1
B-2
C+0.5
D+2
Answer & Solution
Correct answer: D. +2
1/v = -1/10 + 1/5 = 1/10 so v = +10 cm, and m = -v/u = +2, an erect enlarged virtual image.
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