Thin Lens Equation Calculator

How to use it

1. Enter focal: 0.1 m
2. Enter obj_dist: 0.3 m
3. Calculate and display the img_dist result

Common mistakes

• ⚠️ Not verifying input values are within realistic ranges for your scenario
• ⚠️ Entering zero or negative values where positive numbers are required
• ⚠️ Rounding intermediate results too early in multi-step calculations

Worked example

Calculate image distance for 20cm focal length, 30cm object.

The calculated result provid is the main output value.

Input guide