Optics Question 824

Question: The given lens is broken into A four parts and rearranged as shown. If the initial focal length is/then after rearrangement the equivalent focal length is-

Options:

A) f

B) f/2

C) f/4

D) 4f

Show Answer

Answer:

Correct Answer: B

Solution:

[b] Cutting a lens in transverse direction doubles their focal length i.e. 2f.

Using the formula of equivalent focal length, $ \frac{1}{f}=\frac{1}{f _{1}}+\frac{1}{f _{2}}+\frac{1}{f _{3}}+\frac{1}{f _{4}} $

We get equivalent focal length as f/2.



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