Airy disc

(redirected from Airy ring)

Airy disc

(ār'ē),
the image of a circular blur formed by a distant point source of light on the retina because of diffraction by the edge of the pupillary aperture where the diameter of the image decreases as the aperture increases.

Airy disc

(ār'ē disk)
The image of a circular blur formed by a distant point source of light on the retina because of diffraction by the edge of the pupillary aperture where the diameter of the image decreases as the aperture increases.
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However, complications arise because of the wave nature of light: diffraction causes concentric Airy rings in the image of the star, which are not blocked by the mask and are still millions of times brighter than the planet.