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17 May, 15:46

Ask Your Teacher In a choir practice room, two parallel walls are 4.00 m apart. The singers stand against the north wall. The organist faces the south wall, sitting 0.680 m away from it. To enable her to see the choir, a flat mirror 0.600 m wide is mounted on the south wall, straight in front of her. What width of the north wall can the organist see

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  1. 17 May, 15:51
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    Answer: 4m

    Explanation:

    Since the angle of incidence of a plane mirror can be anything from 0 to 90°

    Assuming that the place is a perfectly square 4*4m room

    The incident ray would be 45° for the choir (object) at a 4m distance, this is still within the range of values.

    We do not forget also, that the focal length of a plane mirror is infinity, the organist would in fact see farther than 4m if need be. And wider
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