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a) image is 2 metre away from mirror
b) image is 4 m away from boy himself.
after 1 second his image is 3 m metre away from the boy himself
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The image formed in a plane mirror is as far behind the mirror as the object is in front of it, i.e. the distance between the object and the mirror (u) is the same as the distance between the mirror and the image (v). Distance between object (boy) and the image is u + v = 2m + 2m = 4m.
And
and if he walks with a speed of 0.5 m/s then after 1 second the distance will be 3meters.
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