A boy stands 2 m in front of a plane mirror and then walks 1 m TOWARD the mirror. The DISTANCE between him and his image NOW is:
A1 m
B3 m
C2 m
D4 m
Answer & Solution
Correct answer: C. 2 m
After walking 1 m toward the mirror, the boy is now 1 m in front of it. His image is therefore 1 m BEHIND the mirror. Distance between boy and image = 1 + 1 = 2 m. (Note: as he moves toward the mirror, the image also moves toward the mirror by the same amount, so the gap shrinks at twice the boy's walking speed.)
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