Science (086) — AI-generated practice question

Change in image as object moves from infinity to pole:

When the object is at infinity, the image is formed at the focus F (behind the mirror) — it is highly diminished (point-sized), virtual and erect. As the object moves closer towards the pole, the image shifts from F towards the pole P, remains virtual and erect, but increases in size (though always diminished compared to the object). At the pole, the image is at P, same size as the object.

Property making it suitable for shopping malls and road bends:

A convex mirror has a wider field of view (curved outward) and always forms a virtual, erect, and diminished image regardless of object position. This allows a larger area to be viewed in a small mirror, making it ideal for surveillance in shopping malls and for monitoring traffic around road bends.

Source: Chapter 9, Section 9.2 — Image formation by a Convex Mirror / Uses of convex mirrors

---

• Examiners expect you to clearly state both positions (infinity and between infinity and pole) and the change in image (position shifts from F toward P, size increases but stays diminished).
• For the second part, the two key properties are: wider field of view + always erect & diminished image. Mention both for full marks.
• Table 9.2 is the direct source for image positions — memorise it.
• "Virtual and erect" must always be stated as the nature of image in a convex mirror.