🔍 Focal Length Calculator
Calculate lens focal length using object and image distances
🎯 Calculation Results
🔍 How to Use the Focal Length Calculator
- Enter the object distance (distance from object to lens)
- Enter the image distance (distance from lens to image)
- Select the appropriate units for each distance
- Click “Calculate” to find the focal length
📐 What is Focal Length?
- Distance between the lens and the focal point where parallel rays converge
- Critical parameter in optics for image formation and magnification
- Used in cameras, microscopes, telescopes, and corrective glasses
- Determines the lens’s ability to converge or diverge light rays
🧮 The Lens Formula
Thin Lens Equation:
1/f = 1/do + 1/di
Where: f = focal length, do = object distance, di = image distance