If the magnification of a virtual image formed ... - JAMB Physics 2016 Question
If the magnification of a virtual image formed by an object 10cm from a convex less is 3, then the focal length of the lens is
A
10cm
B
20cm
C
25cm
D
15cm
correct option: d
M = (\frac{v}{u}) = 3 = (\frac{v}{30}). V = 30m
(\frac{1}{u}) + (\frac{1}{v}) = (\frac{1}{f}) = (\frac{1}{10}) - (\frac{1}{30}) = (\frac{1}{f})
(\frac{3 - 1}{30}) = (\frac{1}{f}
f = (\frac{30}{2}) = 15cm
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