An Aragoscope is a telescope design based on diffraction around the edge of an occluding disc, named after French scientist François Arago. == Concept == The light diffracted around the edge of a perfectly circular occluder interferes constructively at the central axis, producing a bright spot known as the Arago spot.
An Aragoscope is a telescope design based on diffraction around the edge of an occluding disc, named after French scientist François Arago. == Concept == The light diffracted around the edge of a perfectly circular occluder interferes constructively at the central axis, producing a bright spot known as the Arago spot.
Source: Wikipedia "Aragoscope" · CC BY-SA 4.0
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