At what distance from a concave mirror of focal length 25 cm should an object be placed so that the size of image is equal to the size of the object. Draw a ray diagram to show this.

Explanation

To solve the problem of finding the distance from a concave mirror of focal length 25 cm at which an object should be placed so that the size of the image is equal to the size of the object, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Relationship Between Focal Length and Radius of Curvature**:
The focal length (f) of a concave mirror is related to its radius of curvature (R) by the formula:
\[
R = 2f
...