An antumbra is the region of a shadow where the light source is partially obscured by an object, but the observer can still see the light source. To an observer located in the antumbra during an eclipse, for example, the appearance is characterized by a bright ring around an opaque object. This is because the edges of the object do not completely block the light from the source, resulting in a halo effect around the obscured object.
What does an antumbra look like to an observer?
the disappearance of a bright object
a light shadow across an object
a blackened area across an object
a bright ring around an opaque object
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1 answer