Standard Science Primary 4 Energy

Which observation proves that light travels in a straight line?

A We can see through clear glass.
B Light can be reflected by a mirror.
C A shadow is formed when light is blocked by an opaque object.
D A rainbow is formed after rain.
Show Worked Solution

Worked Solution

Step 1: If light could bend around objects, it would fill the area behind an opaque object. Step 2: Because light travels in straight lines, it is blocked, creating a sharp shadow. Step 3: This is the standard MOE evidence for the straight-line property of light.

Correct answer: A shadow is formed when light is blocked by an opaque object.

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