Optics Question 607

Question: Two lenses of power 6D and - 2D are combined to form a single lens. The focal length of this lens will be

[MP PET 2003]

Options:

A) $ \frac{3}{2} $ m

B) $ \frac{1}{4} $ $ m $

C) 4 m

D) $ \frac{1}{8} $ $ m $

Show Answer

Answer:

Correct Answer: B

Solution:

Combined power $ P=P _{1}+P _{2}=6-2=4D $ .

So focal length of combination $ F=\frac{1}{P}=\frac{1}{4}m $



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