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 Rectilinear propagation of light questions and answers

Figure 1 shows a mirror XY placed equidistant from two parallel lines AB and PT. Four students stand at in front of the mirror.
(a) Indicate the position of the images of students at QR and T on the line AB.
(b) State which of the three images are visible to the student standing at P.
(c) Using rays to indicate on the figure, how (b) above is possible.

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