Ask Science@lemmy.worldEnglish · 10 months ago

Help me understand this effect

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Help me understand this effect

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Wogi@lemmy.world to

Ask Science@lemmy.worldEnglish · 10 months ago

This is an abrasive disk, rotating at 1500 rpm. When I shine my flashlight at it, it carries the glow with it, approximately halfway around the disk. What am I seeing happen here?

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20 days ago
It’s a cheap LED pen light, they hand them out like candy where I work. Most of us have our own flashlights anymore.

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