A real image of an object fomed 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?

By: |Published on: Aug 31|Categories: Physics WAEC| 0 comments

A. 30cm
B. 25cm
C. 20cm
D. 15cm
E. 10cm

Correct Answer:

Option C – 20cm

Explanation

1/u + 1/3u = 1/15; u = 20cm

Users Also Read These:

SEE ALSO  An inductor of inductance 10 H is connected across an a.c circuit source of 50 V, 100 Hz. What is the current in the circuit? [Ï€ = 3.14]

Copyright warnings! Do not copy.