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NEET2008PhysicsRay OpticsActual

Two thin lenses of focal lengths f₁ and f₂ are in contact and coaxial. The power of the combinations is

Options

  1. Af₁+f₂ f₁ f₂
  2. Bf₁ f₂
  3. Cf₂ f₁
  4. Df₁+f₂ 2

Correct answer

A. f₁+f₂ f₁ f₂

Step-by-step solution

aligned & 1 f = 1 f₁ + 1 f₂ P & = f₁+f₂ f₁ f₂ aligned

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