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Wave Optics — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsWave Optics1 Mark
MCQ
The resolving power of a telescope depends on:
  • A
    Length of telescope
  • B
    Focal length of objective
  • C
    Diameter of the objective
  • D
    Focal length of eyepiece
✓

Answer

  1. Diameter of the objective

Explanation:

Resolving power of telescope $\text{R}=\frac{1}{\Delta\theta}=\frac{\text{a}}{1.22\lambda}$

where, $\Delta\theta$ is angular separation between two objects.

a is the diameter of the objective.

$\lambda$ is wavelength of light.

So, clearly resolving power of a telescope depends on diameter of the objective.

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