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Question: Answered & Verified by Expert
A convex lens has a focal length $f$. It is cut into two parts along the dotted line as shown in the figure. The focal length of each part will be

PhysicsRay OpticsJEE Main
Options:
  • A $\frac{f}{2}$
  • B $f$
  • C $\frac{3}{2} f$
  • D $2 f$
Solution:
1940 Upvotes Verified Answer
The correct answer is: $2 f$
$f=\frac{R}{2(\mu-1)}, f^{\prime}=\frac{R}{(\mu-1)} \Rightarrow f^{\prime}=2 f$

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