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Concept
Penumbra
The penumbra is the
partially shaded outer region
of the
shadow cast by an opaque object
, where the
light source
is only
partially blocked
. It is crucial in
understanding phenomena
such as eclipses, where it defines the
area of partial illumination
between the umbra, the
darkest part of the shadow
, and
full light
.
Relevant Degrees
Optics 60%
The Solar System 40%
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