Question

Two boys are standing in front of a plane mirror as shown. If boy Y walks 5 m towards boy X, how far away would boy Y appear to be in the mirror to boy X?

• A. 10 m
• B. 14 m
• C. 9 m
• D. 11 m

Answer 1

The correct option is D 11 m

As boy Y is moved 5 m towards boy X, so the distance between them is now 7 m.

We know that in a plane mirror, the image is formed at the same distance from the mirror as the object is in front of the mirror.

Since boy Y is 9 m (2 m + 7 m) from the mirror, his image will be 9 m behind the mirror.

Therefore, the total distance between boy X and Y’s image is 11 m (2 m + 9 m).