1.8 x10 ^ -4 radian is the angle between two just-resolvable points of light for a 2.75 mm diameter pupil in radians.
Rayleigh Criterion
This problem is related to the Rayleigh Criterion, which provides the following formula to find the acuity or limit of resolution of an optic system with a circular aperture (the eye in this case):
Formula - angle = 1.22 ( Lamda / distance)
Where: The angle of resolution, The wavelength of the light, Diameter of the pupil
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