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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

$50 \sqrt{2} s$

c

$25 \sqrt{2} s$

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

Question Image

$t = \frac{2 \sqrt{2} m}{4 \times 10^{- 2} m / s} = 50 \sqrt{2} s$

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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