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A cubical room is formed with 6 plane mirrors.An insect moves along the diagonal of the floor with uniform speed.The velocity of its image in two adjacent walls is 20underroot2 cms^-1.Then the velocity of image formed by the roof is
The velocity of image along the floor is 20 cm/sec as its component in side walls is 14.14 cm/sec each
so the velocity of image roof is same as floor equals 20 cm/sec
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