A mirror 1 m high hangs on a wall. A man stands a distance of 2 m away from the mirror. What is the height of the portion of the opposite wall in the room that can be seen by the man in the mirror without changing the position of his head? The wall is 4 m from the mirror.
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Sol. The image of the wall will be behind the mirror at a distance l 2 = 4 m. If the eye is placed at the point A (Fig.) it will see only the rays coming from all the points in the section of the wall image DE after the reflection in the mirror BC. Thus, the section of the wall visible in the mirror will have dimensions.
X = 
a = 3m.
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