WAEC - Physics (1997 - No. 12)
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?
2cm
3.3cm
4cm
5cm
15cm
Forklaring
M=\(\frac {v}{u}\) = 5
v = 5u
But, v = 20,
V = 5u = 20
u = \(\frac{20}{5}\) = 4 cm.