Definition:
Magnification of a spherical mirror is defined as the ratio of the height of the image to the height of the object. It is denoted by the letter "m".

Types of Spherical Mirrors:
There are two types of spherical mirrors:
1. Concave mirror
2. Convex mirror

Magnification in Concave Mirror:
In a concave mirror, the magnification is positive. It can be determined using the following formula:
m = -v/u
where,
m = Magnification
v = Image distance
u = Object distance

The magnification of a concave mirror is always less than one, except when the object is placed between the pole and the focus.

Magnification in Convex Mirror:
In a convex mirror, the magnification is negative. It can be determined using the following formula:
m = -v/u
where,
m = Magnification
v = Image distance
u = Object distance

The magnification of a convex mirror is always less than one, irrespective of the position of the object.

Significance of Magnification:
The magnification of a spherical mirror helps in determining the size of the image formed by the mirror. It is also used to determine the type of image formed, i.e., whether it is real or virtual, erect or inverted, and diminished or magnified.

Applications of Magnification:
1. Magnification is used in telescopes and microscopes to obtain magnified images of distant objects or microscopic specimens.
2. Magnification is used in cameras to obtain clear and sharp images of distant objects.
3. Magnification is used in rearview mirrors of vehicles to obtain a wider field of view.

In conclusion, magnification is an important concept in spherical mirrors that helps in determining the size, type, and clarity of the image formed. It is widely used in various applications, including telescopes, microscopes, cameras, and rearview mirrors.

The magnification, m, is defined as the ratio of the image height to the object height, which is closely related to the ratio of the image distance to the object distance: A magnification of 1 (plus or minus) means that the image is the same size as the object.