Calculateur d'Équation de Lentille Gratuit
Résolvez l'équation des lentilles minces. Trouvez la position de l'image, la distance focale ou la distance objet.
Distance de l'image
15.00 cm
Image Distance vs Focal Length
Formule
Thin Lens Equation
The thin lens equation relates object distance, image distance, and focal length.
Formula
1/f = 1/d_o + 1/d_i
Positive focal length for converging lenses, negative for diverging. Magnification: M = -d_i / d_o. Negative M means inverted image.
Exemple Résolu
An object 30 cm from a converging lens with focal length 10 cm.
- 011/f = 1/do + 1/di
- 021/10 = 1/30 + 1/di
- 031/di = 1/10 - 1/30 = 3/30 - 1/30 = 2/30
- 04di = 15 cm
- 05M = -15/30 = -0.5 (inverted, half size)
Questions Fréquentes
What does a negative image distance mean?
A negative image distance means the image is on the same side as the object (virtual image). This happens when the object is inside the focal length.
What is a virtual image?
An image that cannot be projected onto a screen. Light rays appear to diverge from the image location but do not actually pass through it.
How does a magnifying glass work?
By placing an object inside the focal length of a converging lens, creating an enlarged virtual image.
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