Physics

Thin Lens Equation Calculator

Find image distance from object distance and focal length.

Object distance

Focal length

Calculated Output

Image distance 15

Magnification (x) -0.5

Formula: 1/f = 1/dₒ + 1/dᵢ

Step-by-Step Breakdown

1. Values used:

2. Object distance = 30

3. Focal length = 10

5. Image distance = 15

6. Magnification = -0.5x

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The math behind it

1/f = 1/object distance + 1/image distance. Magnification = −image ÷ object.

object 30, f 10 → image 15, magnification −0.5.

Negative image distance?

Means a virtual image on the same side as the object.