Assuming human pupil to have a radius of 0.25 cm and a comfortable viewing distance of 25 cm, the minimum separation between two objects that human eye can resolve at 500 nm wavelength is:
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Question

Assuming human pupil to have a radius of 0.25 cm and a comfortable viewing distance of 25 cm, the minimum separation between two objects that human eye can resolve at 500 nm wavelength is:

G1 Physics · Accepted Answer

Rayleigh's criterion for a circular pupil gives θₘᵢₙ=1.22λ/D, with pupil diameter D=0.50 cm. At viewing distance 25 cm, minimum separation s=Lθₘᵢₙ≈3.05×10⁻⁵ m≈30 μm. Option D.