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Rayleigh's criterion is a fundamental principle in optics that defines the limit at which an optical instrument, such as a telescope or microscope, can distinguish two closely spaced objects as separate. According to Rayleigh, two point sources are said to be just resolvable when the principal diffraction maximum of one image coincides with the first minimum of the diffraction pattern of the other. In simpler terms, it sets a criterion based on diffraction that determines the smallest angular separation at which two ______ _______ _____ ________ ___ ___ _____ _______ __________ ______ ____.
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