Advanced Science Primary 4 Energy

An L-shaped opaque object is placed between a torch and a screen. Which shadow is impossible to form by simply rotating the object?

A A rectangle
B The letter L
C A circle
D A square
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Worked Solution

Step 1: The shadow of an object depends on its cross-sectional profile relative to the light. Step [2-9]: An L-shaped object is made of flat surfaces and corners. Step [2-9]: It has no curved parts, so it cannot produce a circular shadow.

Correct answer: A circle

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