Question : Which of the following pair of the position of an object – position of the image – the size of the image, is not correct for the concave mirror?
Option 1: At F – At infinity – Highly enlarged
Option 2: Between C and F – Beyond C – Enlarged
Option 3: Beyond C – Between F and C – Diminished
Option 4: At infinity – At C – Highly diminished
Correct Answer: At infinity – At C – Highly diminished
Solution : The correct option is At infinity – At C – Highly diminished.
When the object is at infinity, the incoming light rays are parallel to the principal axis. A concave mirror focuses parallel rays at its focal point, which coincides with the centre of curvature (C). So, when the object is at infinity, the image is formed at the centre of curvature. The image formed by a concave mirror when the object is at infinity is highly diminished. This is because the incoming parallel rays converge to a point at the centre of curvature, resulting in a small and highly diminished image.
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