In a "concave mirror", when the position of the object is at the Centre of Curvature (C), what will be the position of the image?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → At C (Center of Curvature)
A ray from an object at the centre of curvature C travels along a radius of the mirror, so it meets the mirror at right angles and is reflected straight back along its own path. Rays from the object therefore meet again at C: the image is formed at C, and it is real, inverted and of the same size as the object.
Why the other options are incorrect
Option (2) Beyond C — Incorrect. The image is beyond C when the object is placed between F and C.
Option (3) At Infinity — Incorrect. The image is at infinity when the object is at the focus F.
Option (4) Behind the mirror — Incorrect. A virtual image behind the mirror forms only when the object is between the pole P and F.