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MHT CET202310 May 2023Evening ShiftPhysicsRay OpticsActual

Two lenses of power -15 D and +5 D are in contact with each other. The focal length of the combination is

Options

  1. A-0.1 ~cm
  2. B-10 ~cm
  3. C-20 ~cm
  4. D+10 ~cm

Correct answer

B. -10 ~cm

Step-by-step solution

P= 1 f For combination of lenses, P = P ₁+ P ₂ Given: P₁=-15 D and P₂=+5 F array ll & P=-10 D & f=- 1 10 ~m & f=-10 ~cm array

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