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In a church choir loft, two parallel walls are 5

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In a church choir loft, two parallel walls are 5.30 m apart. The singers stand against the north wall. The organist faces the south wall, sitting 0.800 m away from it. So that she can see the choir, a flat mirror 0.600 m wide is mounted on the south wall, straight in front of the organist.

What width of the north wall can she see? Hint: Draw a top-view diagram to justify your answer.