AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
The student is incorrect.
From Table 9.1, a concave mirror produces the following images:
| Object Position | Image Nature |
|---|---|
| At infinity | Real, inverted, highly diminished |
| Beyond C | Real, inverted, diminished |
| At C | Real, inverted, same size |
| Between C and F | Real, inverted, enlarged |
| At F | No image formed |
| Between P and F | Virtual, erect, enlarged |
In every case, the concave mirror either forms a real inverted image, or (when the object is between P and F) a virtual erect image that is enlarged — never diminished. A concave mirror cannot produce a virtual, erect, and diminished image for any object position. This combination is exclusive to convex mirrors.
Source: Chapter 9, Section 9.2.1, Table 9.1
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Examiners expect you to go through all six object positions from Table 9.1 systematically. The key point to highlight is that the only virtual + erect image a concave mirror forms (object between P and F) is always enlarged, not diminished. Stating this clearly, ideally with the table, earns full marks. Never confuse concave mirror behaviour with convex mirror behaviour — convex mirrors always give virtual, erect, diminished images regardless of object position.