alleryResolution limit of a telescope by Rayleigh criterion:
Aθ = λ/d
Bθ = 1.22 λ/d (d = aperture)
Cθ = λ²/d
Dθ = d/λ
Answer & Solution
Correct answer: B. θ = 1.22 λ/d (d = aperture)
Two point sources are just resolved when angular separation θ = 1.22 λ/d.
Larger aperture gives better resolution.
Same formula applies to a circular aperture telescope.
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