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The last very large refracting telescope that was built was the Yerkes telescope, more than a century ago; it had a lens 40 inches (about

The last very large refracting telescope that was built was the Yerkes telescope, more than a century ago; it had a lens 40 inches (about 1 metre) in diameter. What were the principal failings of refractors that led them to be replaced by reflectors in modern astronomy? Use annotated sketches if you can

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