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AP EAMCET2007PhysicsRay Optics

In Ramsden eyepiece, the two planoconvex lenses each of focal length f are separated by a distance 12 ~cm . The equivalent focal length (in cm ) of the eyepiece is

Options

  1. A10.5
  2. B12.0
  3. C13.5
  4. D15.5

Correct answer

C. 13.5

Step-by-step solution

d= 2 f 3 f= 3 d 2 = 3 12 2 =18 ~cm Equivalent focal length is aligned f^ & = f₁ f₂ f₁+f₂ + f 4 = 18 18 18+18 + 18 4 & =9+4.5 & =13.5 ~cm aligned

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