16. A camera lens is 50 mm from the film plane. The lens focuses the light from two distant point sources so that the centers of their diffraction patterns are separated by 0.025 mm. Find the smallest diameter of lens aperture in mm that allows these two images to be resolved in the visible wavelength range (400 nm ≤ λ ≤ 700 nm).
(A) 0.80
(B) 1.7
(C) 1.4
(D) 0.85
(E) 0.98.

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