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I first found theta.. .052m/2 = .026m (since .026 above and below the center = .052m)

tan theta = .026m/25300m, and theta = 4.578x10^-5

Then plugging into the rayleigh criterion for resolution limit of theta = 1.22lamda/D, where D is the diameter of the objective lens (same as aperture of camera??)... I get

theta = 1.22lamda/D

4.578x10^-5 = 1.22(550x10^-9)/D

D= .0147m, which is incorrect..

anyone know where I went wrong?

Thanks!