Which scientific instrument did François Arago improve?
Telescope
Microscope
Barometer
Thermometer
Answer
Telescope: François Arago, a French physicist, astronomer, and politician, made significant improvements to the telescope. He devised a new method for measuring the refractive index of glass, which enabled the production of higher-quality lenses. Arago's contributions to telescope design and construction enhanced the instrument's optical performance, allowing for more precise astronomical observations.
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