Solar Panel Fresnel Loss (2D): Ray Diagram & Spectral AR Coating

This is the 2D, ray-tracing companion to the 3D solar-glass simulator: a live side-view diagram where photon streams travel from the sun to the panel's glass and either bounce away as reflected loss or shrink into the glass as absorbed, useful power. Drag the sun along its arc or drag the panel itself to change elevation and tilt directly, or use the sliders for exact values — the same real single-layer thin-film Fresnel calculation (Snell's law, s/p polarisation, quarter-wave interference) drives everything. Two extra chart panels make the physics explicit: one plots reflectance against angle of incidence for both bare and coated glass, the other plots reflectance against wavelength so you can see a quarter-wave coating actually being detuned when its design wavelength drifts away from the sun's peak.