Enter the object distance from the mirror and the image distance from the mirror into the calculator to determine the radius of curvature and focal length.

## Mirror Equation Formula

The following equation is used to calculate the radius of curvature and focal length

1/O + 1/I = 2/R = 1/f

- Where R is the radius of curvature
- f is the focal length
- O is the object distance
- I is the image distance

## Mirror Equation Definition

The mirror equation describes the relationship between the radius of curvature of a mirror and the focal length of the mirror.

## Mirror Equation Example

How to use the mirror equation?

**First, determine the object distance.**Calculate the distance from the object to the mirror.

**Next, determine the image distance.**Calculate the image the mirror projects the object from the mirror itself.

**Finally, calculate the focal length and radius.**Calculate the radius of curvature and focal length using the equation above.

## FAQ

**What is the mirror equation?**

The mirror equation is, 1/O + 1/I = 2/R = 1/f. It’s used to calculate the radius of curvature and focal length of a curved mirror.

**What is a focal length?**

The focal length is the distance from the center of the mirror in which reflect light is most densely focused.