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NEET2006PhysicsRay OpticsActual

A convex lens and a concave lens, each having same focal length of 25 ~cm , are put in contact to form a combination of lenses. The power in diopters of the combination is:

Options

  1. Azero
  2. B25
  3. C50
  4. Dinfinite

Correct answer

A. zero

Step-by-step solution

Focal length of lens f₁=25 ~cm focal length of concave lens f₂=25 ~cm Power of combination in dioptres aligned P=P₁+P₂ & = 100 f₁ + 100 f₂ & = 100 25 + 100 -25 =0 . aligned

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