At what distance from a simple microscope must an object be placed so that the image 5 times the size of the object is produced 20cm from the lens?
A
2cm
B
3.3cm
C
4cm
D
5cm
E
15cm
Verified Correct Answer: C.
Physical Principles & Numerical Solution
M=\(\frac {v}{u}\) = 5
v = 5u
But, v = 20,
V = 5u = 20
u = \(\frac{20}{5}\) = 4 cm.
Source: Myschool Past Questions Archive (Record #26299)