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AP EAMCET20228 Jul 2022Morning ShiftPhysicsRay OpticsActual

Two lenses of powers -1.75 D and +2.25 D are placed in contact. The focal length of the combination is

Options

  1. A100 ~cm
  2. B50 ~cm
  3. C200 ~cm
  4. D150 ~cm

Correct answer

C. 200 ~cm

Step-by-step solution

P = P ₁+ P ₂=-1.75+2.25=0.5 D aligned & 1 f _ net =0.5 & f _ net =2 ~m =200 ~cm aligned

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