1. The problem: A plane mirror of length 2m is kept along the line y=-x as shown in the figure. An insect having velocity of 4 cm/s is moving along x-axis from far away. The time span for which the insect can see its image will be: A)50 sec B)25 sec C)25√2 sec D)50√2 sec 2.The answer given is D-50√2 sec 3. The attempt at a solution: I've tried to solve it by using laws of reflection. but i cant get the answer that is given from the options. So please help! My solution was : the insect can see its image form the bottom of the mirror ie., for 2m for x-axis . so the time span is 2m=200 cm time span= 200/4=50sec but why is the answer 50√2 . Have i done anything wrong?