Focal Length using Distance Formula Calculator

Formula

The formula to calculate the Focal Length of Lens is:

\[ f = \frac{f_1 + f_2 - w}{f_1 \cdot f_2} \]

Where:

\(f\) is the Focal Length of Lens (m)
\(f_1\) is Focal Length 1 (m)
\(f_2\) is Focal Length 2 (m)
\(w\) is the Width of Lens (m)

Definition

The Focal Length of Lens is the distance between the lens's optical center and the image sensor, determining the lens's angle of view and the magnification of the image.

Example Calculation

Let's assume the following values:

Focal Length 1 (\(f_1\)) = 0.4 m
Focal Length 2 (\(f_2\)) = 0.48 m
Width of Lens (\(w\)) = 0.45 m

Using the formula:

\[ f = \frac{0.4 + 0.48 - 0.45}{0.4 \cdot 0.48} \]

Evaluating:

\[ f = 2.23958333333333 \text{ m} \]

The Focal Length of Lens is 2.23958333333333 m.

Conversion Chart

Focal Length 1 (f1)	Focal Length 2 (f2)	Width of Lens (w)	Focal Length (f, m)
0.3	0.48	0.45	2.291666666667
0.35	0.48	0.45	2.261904761905
0.4	0.48	0.45	2.239583333333
0.45	0.48	0.45	2.222222222222
0.5	0.48	0.45	2.208333333333