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Q.

A plane mirror of length 2 m is kept along the line y= -x  as shown in the figure. An insect having velocity 4 of cm/s is moving along the x – axis from far away. The time span for which the insect can see its image will be 

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a

25 s

b

502s

c

252s

d

50 s

answer is D.

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Detailed Solution

 Insects will sea its own image only when it is between A and O 
 

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t=22m4×10−2m/s=502s

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