A telescope of objective lens diameter 2 m uses light of wavelength 5000 Å for viewing stars. The minimum angular separation between two stars whose image is just resolved by the telescope is

Question

A telescope of objective lens diameter 2 m uses light of wavelength 5000 Å for viewing stars. The minimum angular separation between two stars whose image is just resolved by the telescope is, 4 × 1 0 - 4 r a d, 0.25 × 1 0 - 6 r a d, 0.31 × 1 0 - 6 r a d, 5 × 1 0 - 3 r a d

MARKS App · Accepted Answer

Minimum angular separation between two stars whose image is just resolved by telescope is Δθ = 1 .22 λ a ∴ Δθ = 1 .22 × 5000 × 10 - 10 2 Δθ = 3050 × 10 - 10 = 3 .05 × 10 - 7 rad Δθ ≈ 0 .31 × 10 - 6 rad

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