Simulation of beams of light originating inside a glass block. The lowest ray approaches the critical angle and the emerging beam hugs the surface of the block and a substantial amount of the light is reflected back inside the block.
Illustration ID: APPROACHING_TIR
copyright Russell Kightley
Illustration size: 64.0 Mpixels (183 MB uncompressed) - 8000x8000 pixels (26.7x26.7 in / 67.7x67.7 cm at 300 ppi)