This is a demonstration of the Schlieren effect. This setup allows you to see changes in air density. The point light source is aimed at the concave mirror. The concave mirror reflects to a focal point. There you use a sharp edged object to partially block the light which helps create a shadow effect that allows you to see air movement.

Thodoris

I'm the creator of AllFlavors TV a "child" of my main website AllFlavors.NET (in Greek). Apart from being online, I love to play with my two kids.

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