12. David is observing his image in a plane mirror. The distance between the mirror and his image is 4 m. If he moves 1 m towards the mirror, then the distance between David and his image will be
  (i) 3 m       (ii) 5 m       (iii) 6 m      (iv) 8 m

Answers (1)
We are given the distance between the mirror and his image  = 4 m

Now, if David moves 1 m towards the mirror, then the distance is  = 4 − 1 = 3 m

Hence, the distance between David and his image is  = 3 + 3 = 6 m.

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