Light rays that are parallel to the principal axis of a concave mirror converge at a specific point on its principal axis after reflecting from the mirror. This point is known as the principal focus of the concave mirror.
Characteristics of image obtained by a concave mirror
There are five cases through which one can understand the characteristics of image obtained by a concave mirror and they are as follows:
| Object placement | Image obtained | Image characteristics |
| When the object is placed at infinity | Image obtained is at the focal point | Image is a point |
| When the object is moved from infinity to center of curvature | Image move from focal point to center of curvature | The size of the image is increased, real, and inverted |
| When the object is at center of curvature | Image obtained is at center of curvature | The size of the image remains the same, real, and inverted |
| When the object move from center of curvature to focal point | Image move from center of curvature to infinity | The size of the image is bigger than the object, real, and inverted |
| When the object is at focal point | Image is at infinity | Infinitely big |
| When the object move from the focal point to mirror | Image move from minus infinity to mirror | The size of the image decreases, larger than the object, virtual, and upright |
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