A thin double convex lens of focal length f is broken down into two halves at the axis. The two haves are then combined, as shown in the figure. What will be the focal length for the arrangements?
The Attempt at a Solution
For (i), I think that the answer is infinite because any incident ray will either go undeviated or will be laterally displaced - but the combination will not be able to converge it.
Is it right?
And, about the second arrangement - I think it must be 2f, but in my book, f/2 has been given as the answer!
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