What must be the distance between an object and... - JAMB Physics 1990 Question
What must be the distance between an object and a converging lens of focal length 20cm to produce an erect image two times the object height?
A
20cm
B
15cm
C
10cm
D
5cm
correct option: c
F = \(\frac{uv}{u + v}\); v = 2u
20 = \(\frac{ux - 2u}{u + (-2u)}\); u = 10cm
20 = \(\frac{ux - 2u}{u + (-2u)}\); u = 10cm
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