A combination of two thin lenses in contact have power +10 D. The power reduces to +6 D when the lenses are 0.25 m apart. The power of individual lens is (a) 5 D, 5 D (b) 6 D, 4 D (c) 7 D, 3 D (d) 8 D, 2 D

Answer: (d). P₁ + P₂ = 10 and 6 = 10 - 0.25 P₁P₂. P₁P₂ = 16; sum 10, product 16 gives 8 and 2. So the answer is (d) 8 D, 2 D.

A combination of two thin lenses in contact have power +10 D. The… | MHT CET 2023 (14 May, Shift 1)

Q35MHT CET 2023 · 14 MAY · SHIFT 1Medium

Combination of Lenses

A combination of two thin lenses in contact have power $+10\text{ D}$ . The power reduces to $+6\text{ D}$ when the lenses are $0.25\text{ m}$ apart. The power of individual lens is

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Answer: (d)

$P_1 + P_2 = 10$ and $6 = 10 - 0.25\,P_1P_2$ .
$P_1P_2 = 16$ ; sum 10, product 16 gives $8$ and $2$ .
So the answer is (d) $8\text{ D}, 2\text{ D}$ .

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Combination of Lenses question from MHT CET 2023 (14 May, Shift 1)

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