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MHT CET 2025 (22 Apr, Shift 1) · Combination of Lenses

Combination of Lenses question from MHT CET 2025 (22 Apr, Shift 1)

Q13MHT CET 2025 · 22 APR · SHIFT 1Medium

Combination of Lenses

Two thin lenses having $R_1, R_2$ as the radii of curved surfaces are kept coaxially together. Their power is proportional to

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Answer: (d)

Lens maker formula: $P \propto \frac{1}{R_1} + \frac{1}{R_2}$ (magnitudes, for a converging combination).
$\frac{1}{R_1} + \frac{1}{R_2} = \frac{R_1 + R_2}{R_1 R_2}$
So the answer is (d) $\frac{R_1 + R_2}{R_1 R_2}$ .

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