Total Internal Reflection
Trapped light.
A tip for the dear citizens of Schilda: here’s how you could have brought light into the windowless town hall! The method is based on a physical law: angle of incidence = angle of reflection.
Inside a Plexiglas rod, a laser beam shines. Its angle is adjustable. When the laser beam hits a side surface, it is fully reflected – and, according to the law of reflection, emitted again at the same angle.
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