Mirror Calculator

Calculate focal length, object distance, image distance, and magnification for spherical mirrors

Enter any two values to calculate the third (1/f = 1/d_o + 1/d_i)

Object Distance (cm):

Image Distance (cm):

Focal Length (cm):

Sign convention: Concave mirror has positive f, convex has negative f. Real images have positive d_i.

1/f = 1/d_o + 1/d_i (mirror equation)

M = -d_i / d_o (magnification)

R = 2f (radius of curvature)