The Airy disc is just over 3 nM in radius. The first diffraction ring is just over 4 nM in radius.
Diffraction pattern and radial intensity distribution for a perfect, unobstructed parabolic mirror, perfectly supported. Diameter = 317.5 mm (12.5 in). Focal Length = 1587.5 mm (62.5 in). f/ Number = 5. Thickness = 30.48 mm (1.2 in). Material = Pyrex 7740.
| Diffraction Pattern | |
| Radial Distribution of Intensity
The Airy disc is just over 3 nM in radius. The first diffraction ring is just over 4 nM in radius. |
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