Mirror Equation Calculator

Find image distance for a curved mirror.

Object distance

Focal length

Image distance 13.333

Magnification (x) -0.6667

Formula: 1/f = 1/dₒ + 1/dᵢ

Step-by-step with your numbers:

1. Values used:

2. Object distance = 20

3. Focal length = 8

5. Image distance = 13.333

6. Magnification = -0.6667x

Did we solve your problem today?

Curved mirrors follow the same equation as thin lenses.

The math behind it

1/f = 1/object + 1/image. Concave mirrors have positive f; convex negative.

object 20, f 8 → image 13.3.

Focal length?

Half the radius of curvature.