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quote:Originally posted by daveshortsThe cunning of a liquid mirror is that if you spin a liquid the shape it will take up is a parabola - the ideal shape for a telescope mirror. This means that you can build very large, very perfect mirrors, very cheaply. Unfortunately there is a downside, you can only look straight up as the shape isn't correct in any other direction.
quote:Originally posted by ROBERTThis liquid optics device is almost what Realmswalker was describing:-""The interface between the oil and water will change shape depending on the voltage applied across the conical structure. At zero volts, the surface is flat, but at 40 volts, the surface of the oil is highly convex.""http://www.theregister.com/2004/12/01/varioptics_liquid_lens/