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JEE Main 2025 (22 Jan, Shift 2) · Combination of Lenses

Combination of Lenses question from JEE Main 2025 (22 Jan, Shift 2)

Q19JEE Main 2025 · 22 JAN · SHIFT 2Medium

Combination of Lenses

A symmetric thin biconvex lens is cut into four equal parts by two planes $AB$ and $CD$ as shown in figure. If the power of original lens is 4D then the power of a part of the divided lens is

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Answer: (a)

Cut along AB (axis) does not change power; cut along CD (plane of the lens) leaves one curved surface, halving the power.
Each piece is plano-convex: $P = \frac{4}{2} = 2\text{ D}$ .
So the answer is (a) 2D.

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