TAMU Physics & Astronomy on Instagram: "See hot or cold air in the mirror! Isn't #science amazing? #SchlierenOptics lets us see air movement by using light bending through air with different temperatures. A light is focused onto a small point by a spherical mirror, and then part of the light is blocked by a knife edge. When air is still, the light is blocked evenly. But when air moves or has different temperatures, it bends the light slightly. Some light is blocked by the knife edge, while other

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