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MHT CET202617 April 2026Morning ShiftPhysicsRay OpticsActual

In telescopes for a given wavelength, the objectives with large aperture are used for

Options

  1. Agreater resolution.
  2. Breducing lens aberration.
  3. Cgreater magnification.
  4. Dease of manufacture.

Correct answer

A. greater resolution.

Step-by-step solution

The resolving power of a telescope is given by the formula D 1.22 , where D is the diameter of the objective lens (aperture) and is the wavelength of the light. For a given wavelength , the resolving power is directly proportional to the aperture D . Therefore, objectives with a large aperture are used to achieve greater resolution. Answer: greater resolution.

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