Object placed in front of concave mirror at very far distance
The image formed when an object is placed in front of a concave mirror at a very far distance is called the "far point image". In this case, the object is placed beyond the focal point of the concave mirror.

Formation of the image
When the object is placed at a distance greater than twice the focal length from the concave mirror, a real and inverted image is formed between the focal point and the mirror. The image is highly diminished in size and is located at the focus of the concave mirror.

Characteristics of the image
- The image formed is real and inverted.
- The image is highly diminished in size.
- The image is located between the focal point and the mirror.

Explanation
When the object is placed at a very far distance from the concave mirror, the rays of light coming from the object are almost parallel to the principal axis after reflection from the mirror. These parallel rays converge at the focus of the concave mirror and form a real and inverted image.
In this scenario, the image formed is highly diminished due to the large distance between the object and the mirror. The characteristics of the image, such as being real and inverted, are a result of the reflection properties of the concave mirror.
Overall, when an object is placed at a very far distance from a concave mirror, a real and inverted image is formed between the focal point and the mirror, which is highly diminished in size.