A geometry puzzle

This article presents a geometry puzzle related to detecting high-energy particles using scintillating crystals. It explores how light emitted inside a crystal bounces off edges before reaching a detector, affecting the detected light fraction. The author derives formulas for light power exiting left and right faces using infinite geometric series, considering reflection coefficient R and crystal aspect ratio w. The analysis extends to angled emission and varying parameters, illustrated with animations. The content is physics-focused but involves mathematical modeling and problem-solving relevant to technical/scientific computing.