Ferrofluid mirror
Encyclopedia
Ferrofluid mirrors are commonly used in adaptive optics as a deformable mirror. They are made of a ferrofluid
Ferrofluid
A ferrofluid is a liquid which becomes strongly magnetized in the presence of a magnetic field.Ferrofluids are colloidal liquids made of nanoscale ferromagnetic, or ferrimagnetic, particles suspended in a carrier fluid . Each tiny particle is thoroughly coated with a surfactant to inhibit clumping...

that uses electromagnets to change its shape.
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