DIFFERENCE BETWEEN
1] UMBRA AND PENUMBRA *
Answers
Q) DIFFERENCE BETWEEN
UMBRA AND PENUMBRA *
ANSWER:-
The Umbra
In physics, the umbra refers to the darkest part of the shadow. If you aim a light source directly at an object, the blackest portion of the shadow directly behind the object is the umbra of the shadow. In astronomy, if the sun is shining directly on the western hemisphere of the earth, the eastern hemisphere is bathed in darkness, and objects behind the earth (such as the moon or other planets) are in the earth’s umbra.
The Penumbra
Penumbra refers to the lighter shading that hangs on the outskirts of the umbra. The penumbra is not a true shadow. The Lighting Design and Simulation Knowledgebase describes the penumbra as a gradient: The shading gradually lessens from shadow to light as the penumbra stretches away from the umbra.
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