Optics Question 644

Question: Two thin lenses whose powers are +2D and -4D respectively combine, then the power of combination is

[AFMC 1998; CPMT 1996; Very Similar to BHU 2004]

Options:

A) - 2D

B) + 2D

C) - 4D

D) + 4D

Show Answer

Answer:

Correct Answer: A

Solution:

$ P=P _{1}+P _{2}=2D-4D=-2D. $



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