Calculateur d'Équation de Miroir Gratuit
Résolvez l'équation des miroirs sphériques. Trouvez la position de l'image formée par un miroir concave ou convexe.
Distance de l'image
40.00 cm
Image Distance vs Focal Length (+ concave, - convex)
Formule
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.
Exemple Résolu
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)
Questions Fréquentes
What is the difference between a concave and convex mirror?
A concave mirror curves inward (like a bowl) and can form real images. A convex mirror curves outward and always forms virtual, diminished images.
Where are concave mirrors used?
In telescopes, shaving/makeup mirrors, flashlight reflectors, and satellite dishes.
Why do convex mirrors show a wider view?
Convex mirrors diverge reflected light, creating a smaller virtual image but capturing a larger field of view. This is why they are used for rear-view mirrors.
Apprendre