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. $



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