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Question
What can you say about the edges of a shadow?
Options:
A .  They are always blurry.
B .  They are always sharp.
C .  The sharpness is high if the light is from a point source.
D .  The sharpness is low if the light is from a point source.
Answer: Option C
:
C
Ashadowis a region where light from a light source is obstructed by an opaque object. When a single point source of light is present, the screen behind has a clear dark region. But, when multiple sources are present, a part of the screen is partially dark, anda part of the screenis completely dark. This causes the formation of blurred shadow.

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