When an object is cm away from pole of a concave spherical mirror, the size of the image is equal to that of object.
The focal length of the mirror is__________
Step : Given data
Given: is the object distance from pole and is the image distance
is magnification
Step : Finding the value of
We have a magnification formula,
Step : Finding the value of focal length
We have a formula,
Thus, the focal length of the mirror is .