Optics Question 597
Question: Two thin lenses, one of focal length + 60 cm and the other of focal length -20 cm are put in contact. The combined focal length is
[CPMT 1973, 89; BVP 2003]
Options:
A) + 15 cm
B) -15 cm
C) + 30 cm
D) -30 cm
Show Answer
Answer:
Correct Answer: D