OPTICS – Drink for free with physics

So I’ll bet you a good Bordeaux I can make the arrows point different ways without touching them.

The physics:

The water in the glass creates a cylindrical shape that resembles a magnifying glass which flips the image on the vertical axis due to refraction: light converges somewhere in the middle of the glass and is projected – flipped – through the front.

More info and original video here.

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