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What aperture in the human eye would be involved with diffraction & what diffraction occurs in the eye, location wise

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The angular resolution of the human eye is diffraction-limited and arises from the finite pupil diameter. We can only differentiate points which are separated at least by an angular distance of about 1 arcminute. This matters a lot for amateur astronomers: Double stars can only be resolved with the naked eye if they are further apart than the angular resolution.

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