Question

Q7. A girl stands at a distance of 2.5 metres in front of a plane mirror.How far and in what direction must she move so that she will be 3 metres from her image?
A. One metre towards the mirror
B. Half a metre towards the mirror
C. Half a metre away from the mirror
D. One metre away

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Answer 1

Answer:

one metre away must be the right answer

Answer 2

Answer:

a. one meter towards the mirror

Explanation:

See,

the distance between the mirror and the object is the same between the mirror and the image... (girl is our object here)

so, if the girl moves one meter towards the mirror, then the total distance between her and the mirror would be 1.5 meter...

and thus the distance between the image and the mirror would also change to 1.5m from which we can conclude that the total distance between the girl and her image would be (distance between girl and mirror + distance between mirror and object ) 1.5m + 1.5m = 3m

hence proved.

I hope it's clear now ...