Standard Science Primary 4 Energy

Jun Jie tried to look at a candle flame through a bent plastic tube but could not see it. What does this experiment show about light?

A Light cannot pass through plastic.
B Light can be reflected.
C Light is a source of energy.
D Light travels in straight lines.
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Worked Solution

Step 1: The tube is bent, creating a corner. Step 2: Light from the candle cannot bend to follow the shape of the tube. Step 3: This proves that light travels in straight lines.

Correct answer: Light travels in straight lines.

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