Free Mirror Equation Calculator
Calculate image position for curved mirrors using 1/f = 1/do + 1/di.
cm
cm
Image Distance
40.00 cm
Magnification-1.0000
Image Distance vs Focal Length (+ concave, - convex)
Mirror Equation
The mirror equation is identical in form to the thin lens equation.
Formula
1/f = 1/d_o + 1/d_i
For a concave mirror, f is positive. For a convex mirror, f is negative. The focal length equals half the radius of curvature: f = R/2.
Example Calculation
An object 40 cm from a concave mirror with f = 20 cm.
- 011/f = 1/do + 1/di
- 021/20 = 1/40 + 1/di
- 031/di = 1/20 - 1/40 = 1/40
- 04di = 40 cm
- 05M = -40/40 = -1 (inverted, same size)
Frequently Asked Questions
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