The inhabitants of a planet in another galaxy have their eyes at the exact centre of their 4.0-m long bodies.How long must a plane mirror be for such a creature to be able to see all of its body in the mirror?
A)1.0 m
B)2.0 m
C)2.5 m
D)4.0 m
E)8.0 m

Question

Quizplus · Accepted Answer

For a creature to see its entire body in a plane mirror, the mirror must be at least half the height of the creature. Since the creature's body is 4.0 m long, the mirror must be 2.0 m long.

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