Lens Ray Diagram Constructor
Interactive lens optics simulation with real-time ray tracing and image formation
Converging Lens
f = +20.0 cm
Lens Parameters
Converging Lens •
Focal Length: +20.0 cm
Live Measurements
Object Distance (u)
-60.0 cm
Image Distance (v)
+30.0 cm
Magnification (m)
-0.50×
Image Nature
Real
Inverted
Diminished
Thin Lens Theory
🔍 Thin Lens Equation
1/f = 1/u + 1/v
Relates focal length (f), object distance (u), and image distance (v)
⚡ Lens Power
P = 1/f (meters)
Power in diopters (D). Positive for converging, negative for diverging lenses
📏 Magnification
m = -v/u
Negative magnification indicates inverted image. |m| > 1 means magnified
🎯 Ray Tracing Rules
1. Parallel → Through focal point
2. Through center → Straight
3. Through focal point → Parallel
How to Use
1
Adjust Lens Power: Use the slider to change the lens from -10D to +10D. Positive values create converging lenses, negative values create diverging lenses.
2
Move the Object: Click and drag the red arrow on the left to change the object distance. Watch how the image changes position and size.
3
Observe Ray Tracing: Three colored rays show how light travels from the object through the lens to form the image.
4
Read Measurements: Live calculations show object distance, image distance, magnification, and image properties.