Single correct option
When an object is placed at the principal focus of a concave mirror, the image is formed
- A. at infinity, highly enlarged and real
- B. at the centre of curvature, same size
- C. behind the mirror, virtual and diminished
- D. between the focus and the pole, virtual
Show answer and solution
Answer: (A) at infinity, highly enlarged and real
Rays from a point at the focus become parallel after reflection from a concave mirror, so they meet only at infinity. The image is real and highly enlarged. This principle is used in torches and headlights, where the bulb sits at the focus to give a parallel beam. A virtual image forms only when the object is between the pole and the focus.
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