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MHT CET202611 April 2026Morning ShiftPhysicsRay OpticsActual

For large magnifying power of a telescope

Options

  1. Aobject must be large
  2. Bfocal length of objective is large
  3. Cfocal length of eyepiece is large
  4. Dfocal length of objective and eyepiece must be large

Correct answer

B. focal length of objective is large

Step-by-step solution

The magnifying power of an astronomical telescope in normal adjustment is given by M = f_o f_e , where f_o is the focal length of the objective lens and f_e is the focal length of the eyepiece. For a large magnifying power, the focal length of the objective ( f_o ) must be large and the focal length of the eyepiece ( f_e ) must be small. Answer: focal length of objective is large

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