Question

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:

• A. 3 m
• B. 5 m
• C. 6 m
• D. 8 m

Answer 1

The correct option is C 6 m

In the case of a plane mirror, the distance between the object and the mirror (d1) is same as the distance between image and mirror (d2).

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