Mirror formula: It is a mathematical relation between the object distance is image distance ‘v’ and focal length ‘f of a spherical mirrors. This relation is
\(\frac{1}{u}+\frac{1}{v}= \frac{1}{f}\) or \(\frac{1}{v}+\frac{1}{u}= \frac{1}{f}\)
This formula is applicable to all concave and convex mirrors
Magnification by a spherical mirror:
The ratio of the height of the image to the height of the object is called magnification. It is denoted by in m = \(\frac{h'}{h}\) Where h' = image height, h = object height
Note: Magnification ‘m’ is also related to the object distance (u) and image distance (v). It can be expressed as
m = \(\frac{h'}{h}=\frac{-v}{u}\)
A negative sign in the value of magnification indicates that the image is real.
A positive sign in the value of magnification indicates that the image is virtual.
