Optics Question 628

Question: A convex lens of focal length 0.5 m and concave lens of focal length 1 m are combined. The power of the resulting lens will be

[CPMT 1999; JIPMER 2000]

Options:

A) 1 D

B) - 1 D

C) 0.5 D

D) -0.5 D

Show Answer

Answer:

Correct Answer: A

Solution:

$ P=P _{1}+P _{2} $

$ =\frac{1}{f _{1}}+\frac{1}{f _{2}}=\frac{1}{(0.5)}+\frac{1}{(-1)}=1D $



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