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Two plane mirrors of length L are separa...

Two plane mirrors of length L are separated by distance L and a man `M_(2)` is standing at distance L from the connecting line of mirrors as shown in figure. A man `M_(1)` , is walking in a straight line at distance 2 L parallel to mirrors at speed u,then man at O will be able to see image of `M_(1)` ,for total time:

A

`(4L)/(u)`

B

`(3L)/(u)`

C

`(6L)/(u)`

D

`(9L)/(u)`

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