optics

Lens Formula Visualizer

Interactive 3D ray diagram for the thin lens formula. Adjust focal length and object distance to see real and virtual image formation for convex and concave lenses with principal rays.

Lens Formula

GCSE

The thin lens formula 1/f = 1/u + 1/v relates object distance (u), image distance (v), and focal length (f). Convex lenses converge light and can form real or virtual images. Concave lenses always form virtual, diminished images.

Focal Length15cm

Object Distance30cm

📐 Formulas

\frac{1}{f} = \frac{1}{u} + \frac{1}{v}Thin lens equation

m = \frac{v}{u} = \frac{h_i}{h_o}Image height / object height

P = \frac{1}{f}Lens power in dioptres (m⁻¹)

📋 Syllabus

AQA4.6.2.5

EdexcelTopic 5