World 1 · Reflection & Refraction · 7 minBouncing Around Corners
Periscopes and multi-mirror paths
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Chaining reflections lets you steer light around obstacles. A periscope uses two 45° mirrors to see over a wall — light goes up, then turns to reach your eye.
Each bounce obeys the same law of reflection. Plan a path, then set each mirror’s angle so the beam turns exactly where you need it to.
Check yourself
A periscope turns light through 90° twice using mirrors at…
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