Wonder Chamber / 01 · Geometrical optics

The lens bench

Slide the screen. Find the place where scattered light becomes an upside-down flame.

SCREEN · enlarged view
EYEPIECE · inverted 4×
CANDLE → CONVEX GLASS → SCREEN
Gold lines trace principal rays; drag to orbit.
1/f = 1/dₒ + 1/dᵢ
The law & its limits120 mm objective · n = 1.50 · radii ±120 mm · aperture 40 mm. Telescope: 30 mm eyepiece, 150 mm separation. Ideal thin lenses; no diffraction or aberrations. Lines explain ray paths; the projection integrates a finite aperture. Moon shading inherits the chamber's reflection law.
Optics reference