Alex is observing his image in a plane mirror. The distance between Alex and the mirror is 5 m. If he moves 2 m towards the mirror, then the distance between Alex and his image will be _______.

4 m

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6 m

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8 m

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10 m

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Solution

The correct option is B 6 m
Initially Alex was 5 m away from the mirror and then he moved 2 m towards the mirror, which means he is now 3 m away from the mirror.

We know that in case of a plane mirror, the distance between the object and its image is twice the distance between the object and the mirror.

Hence the distance between Alex and his image will be
$(3 \times 2) m = 6 m .$

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