A girl stands in front of a mirror and sees that no matter where she stands,…
2024
A girl stands in front of a mirror and sees that no matter where she stands, her image is always erect. The mirror is likely to be:
- A.
Either plane or convex
- B.
Only concave
- C.
Only convex
- D.
Only plane
- E.
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Correct answer: A
A girl observes that her image remains erect (upright) regardless of her position in front of the mirror. This means the mirror must always produce a virtual and erect image.
A plane mirror always forms a virtual and erect image for every object position. Similarly, a convex mirror also always forms a virtual and erect image, although the image is diminished in size.
However, a concave mirror does not satisfy this condition. It forms an erect image only when the object is placed between the pole and the focus. If the object is moved beyond the focus, the image becomes real and inverted.
Since the image remains erect irrespective of the girl's position, the mirror cannot be concave. Therefore, the mirror is most likely either a plane mirror or a convex mirror.
Hence, Option A is correct.