1. 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......(a) 4 m (b) 3 m (c) 6 m (d) 12 m Prove the answer with diagram.
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And is 6m as when image is at 4 m from mirror so you are also 4 m from mirror and when you move 1m the image comes 1 m nearer
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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.(a) 4 m (b) 3 m (c) 6 m (d) 12 m Prove the answer with diagram
Answer: ⤵️
(iii) 6 m
In the case of a plane mirror, the distance between the object and the mirror (d1) is same as the distance between the image and the mirror (d2).
Given,
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.
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