Question

To determine the approximate value of the focal length of a given concave mirror, you focus the image of a distant object formed by the mirror on a screen. The image obtained on the screen, as compared to the object is always?

Answer 1

Concave mirror:

1. A spherical mirror with an inwardly curved reflecting surface that faces the center or the middle of the sphere is called a concave mirror.
2. Whenever a hollow spherical is divided into pieces and the outside surface of each cut portion is colored, it forms a mirror, well with the interior surface reflecting. A concave mirror is a name given to this sort of mirror.

When the object is at Infinity:

1. In this circumstance, we examine differently (two) rays coming from the object that is parallel to the primary axis. Following reflection, these rays concentrate and produce an appearance in front of the mirror at F, this same primary focus of the mirror. The resulting image is drastically reduced, point size, actual, and inverted.
2. Whenever an item is positioned at infinity, a true picture forms at the focus. The picture is far less in size than the object.

Therefore, to determine the approximate value of the focal length of a given concave mirror, you focus on the image of a distant object formed by the mirror on a screen. The image obtained on the screen, as compared to the object is always inverted and diminished.