Lens Equation Calculator

Enter Focal Length (f) in cm (leave blank if unknown): Enter Object Distance (u) in cm (leave blank if unknown): Enter Image Distance (v) in cm (leave blank if unknown):

Result: —

What is the Lens Equation Calculator?

The Lens Equation Calculator allows users to determine the unknown parameter in a lens system—focal length, object distance, or image distance—by using the lens formula. By providing any two of the three values, the calculator accurately computes the third, helping students, photographers, and optics enthusiasts analyze lens setups and solve physics problems efficiently.

How to Use:

Enter Known Values: Fill in any two of the three fields: Focal Length (f), Object Distance (u), and Image Distance (v). Leave the field to be calculated blank.
Click “Calculate”: The calculator determines the missing value using the lens formula: 1/f = 1/v + 1/u.
View Results: The tool displays all input values, the calculated missing parameter in cm, and the formula used for reference.