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Geometrical optics — for a thin convex lens of focal length f, if f₁ and f₂ are the distances from the optical centre to two conjugate points P₁ and P₂ respectively, which relationship is correct?

Difficulty: Easy

f = f₁ + f₂
f = (f₁ f₂)/(f₁ + f₂)
1/f = 1/f₁ + 1/f₂
none of these

Correct Answer: none of these

Explanation:

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