To obtain a magnification of 2.5, how far should an object be placed from the pole of a thin converging lens of focal length 0.20m?
A
0.13m
B
0.25m
C
0.28m
D
0.50m
Verified Correct Answer: C.
Physical Principles & Numerical Solution
v = 2.5u
F = \(\frac {uv}{u + v}\)
0.2 = \(\frac {u \times 2.5u}{u + 2.5u}\)
u = 0.28m
Source: Myschool Past Questions Archive (Record #28386)