Which of the following will cast the shadow of a triangle?
A
Football
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B
Birthday cap
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C
Notebook
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D
Disc
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Solution
The correct option is B Birthday cap The shadow of a 3D object is a 2D image, formed when an object blocks the rays of light incident on it.
A birthday cap will cast the shadow of the triangle, a football will cast the shadow a circle and a dice and a notebook will cast the shadow of a square.
The given explanation is illustrated by the following figure.