Optics Question 578
Question: A thin lens focal length and its aperture has diameter d. It forms an image of intensity I. Now the central part of the aperture upto diameter is blocked by an opaque paper. The focal length and image intensity will change to
[CPMT 1989; MP PET 1997; KCET 1998]
Options:
A)
B)
C)
D)
Show Answer
Answer:
Correct Answer: D