HOTS Science Primary 4 Energy

A shadow with a very sharp, clear edge is most likely formed by __________.

A a frosted light bulb
B a translucent object
C a large light source close to the object
D a small light source far away from the object
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Worked Solution

Step 1: Sharp shadows (umbra) are formed when light rays come from a point-like source. Step [2-9]: Large sources or multiple sources cause overlapping light paths, blurring the edges. Step [2-9]: A small source far away approximates a point source, creating sharp edges.

Correct answer: a small light source far away from the object

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