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
Correct Answer: Option C
Explanation
M=(frac {v}{u}=5Rightarrow v=5u=20,let u be x\ v=5x if v=20 then 5x=20 therefore x=20/5=4,u=4cm)