Optics Question 625
Question: A symmetric double convex lens is cut in two equal parts by a plane perpendicular to the principal axis. If the power of the original lens was 4 D, the power of a cut lens will be
[MP PMT 1999]
Options:
A) 2 D
B) 3 D
C) 4 D
D) 5 D
Show Answer
Answer:
Correct Answer: A
Solution:
$ P=P _{1}+P _{2}, $ if $ P _{1}=P _{2}={P}’ $
Therefore $ {P}’=P/2=2D. $
