At what distance from a simple microscope must an object ...
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
Correct answer is C
M=vu=5⇒v=5u=20,letubexv=5xifv=20then5x=20thereforex=20/5=4u=4cm