A lens is cut from the optical center along the principal axis and the two parts of the lens are placed sideways as shown in figure. Then the new focal length of the combination:
Text Solution
Verified by ExpertsThe correct answer is:
C
Ah! If we are assuming the problem intends the two lens halves to be "combined along the axis" (i.e., stacked one after the other) rather than side by side, then yes, the focal lengths add like lenses in contact:
For two thin lenses in contact:
Here, 
, so:
So the new focal length becomes half, which corresponds to option .
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