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9. Ray optics abd optical instruments — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics9. Ray optics abd optical instruments1 Mark
MCQ
For a telescope to have large resolving power the
  • A
    Focal length of its objective should be large
  • B
    Focal length of its eye piece should be large
  • C
    Focal length of its eye piece should be small
  • ✓
    Aperture of its objective should be large
✓

Answer

Correct option: D.
Aperture of its objective should be large
d
(d) Resolving power $\propto$ aperture.

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