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MHT CET202019 Oct 2020Evening ShiftPhysicsRay OpticsActual

An object is clearly seen through an astronomical telescope of length 50 ~cm . The focal lengths of its objective and eyepiece respectively, can be

Options

  1. A5 ~cm and 45 ~cm
  2. B45 ~cm and -5 ~cm
  3. C-45 ~cm and -5 ~cm
  4. D45 ~cm and 5 ~cm

Correct answer

D. 45 ~cm and 5 ~cm

Step-by-step solution

(A) =f₀+f_ e ; f₀ and f₀ are positive. Magnifying power = f₀ f_ e >1

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