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A “hologram”on your cell phone


Posted in Light

Can we cast a visible shadow of a flame? (a shadow of the thing that casts light….)

If you watch this (silent) video you will see a shadow of not only the candle but also the flame. How can we get a shadow that emits light? The trick is to use a light source strong enough to

Posted in 4. Waves, Vibrations, Sound, Light, Light
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