Question

Define the principal focus of concave mirror ​

Answer 1

Answer:

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

Answer 2

Answer:

the point on which the ray of lights come parallel to the mirror converge after reflection is known as the principal focus of concave mirror