A real image of an object fom1ed by a converging lens of focal length 15cm is three times the size of the object. What is the distance of the object from the lens?
-
A.
30cm -
B.
25cm -
C.
20cm -
D.
15cm -
E.
10cm
Correct Answer: Option C
Explanation
1/u + 1/3u = 1/15; u = 20cm