 # Define the Principal Focus of a Concave Mirror?

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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