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The light from man M1 hits the mirror and then reaches the man M2. The positions of the moving man needs to be found when the light from him hits the corners of the mirror to reach the standing man.
From geometry,
AO′=2L+2(2L)
=23L
Similarly BO′=23L+2(23L)
=29L
Hence AB=29L−23L=3L
Time taken to cover this distance=u3L
Similarly time taken to cover CD=u3L
Thus total time he is visible is u6L
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