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Two plane mirrors of length \( L \) are separated by distance \( L \) and a \( \operatorname{man} M_{2} \) is standing at distance \( L \) from the connecting line of mirrors as shown in figure-5 .306. A man \( M_{1} \) is walking in a straight line at distance \( 2 L \) parallel to mirrors at speed \( u \), then man \( M_{2} \) at \( O \) will be able to see image of \( M_{1} \) for total time :
Figure 5.306
(A) \( \frac{4 L}{u} \)
(B) \( \frac{3 L}{u} \)
(C) \( \frac{6 L}{u} \)
(D) \( \frac{9 L}{u} \)
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