Correct Answer: Option C

Explanation

The image in a plane mirror is as far behind the mirror as the girl is in front of it.

If she is at a distance d from the mirror, her image is also d behind it.

Total distance between girl and image = 2d.

 v = \(\frac{\text{d}}{\text{t}}\) or v ∝ d

d = x, v = 4m/s
d = 2x, v = ? (girl & image)

v = 2 x 4 = 8m/s.

There is an explanation video available below.

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