Question

David is observing his image in a plane mirror. The distance between the mirror and his image is 4m. If he moves 1m towards the mirror, then the distance between David and his image will be?

Answer 1

Answer:

6m

Explanation:

As he moves closer to the mirror, the reflected image equally comes closer to the mirror.

David to mirror = 3m

Mirror to david's reflection = 3m

Total = 6m

Answer 2

Answer:

 6 m

Explanation:

Distance between the mirror and David’s image, d2 = 4 m

Therefore, d1 = d2 = 4 m

If David moves 1 m towards the mirror, then d1 = 4 − 1 = 3 m

Again, d1 = d2 = 3 m

Therefore, the distance between David and his image is d1 + d2 = 3 + 3 = 6 m.