Two thin lenses of powers P₁ and P₂ in contact give combined power:
AP₁ - P₂
BP₁ × P₂
CP₁ + P₂
Dsqrt(P₁ P₂)
Answer & Solution
Correct answer: C. P₁ + P₂
In contact: powers add (P = P₁ + P₂). Equivalent focal length: 1/f = 1/f₁ + 1/f₂. Used to design corrective lens systems.
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