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A mirror 1m high hangs on a wall. A man stands at distance 2m away from the mirror. The height of the portion of opposite wall in the room that can be seen by the man in the mirror in the mirror without changing the position of his head is (The wall is 4m from the mirror)?
from the figure the hieght of back wall
seen by the person = 2x + 2 ( 1-x) + 1
= 3 mt.
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