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What is the name of the process that Alvan Graham Clark used to grind and polish the lenses for his refracting telescopes?

  • Diamond turning

  • Ion milling

  • Figuring

  • Electroforming

Answer

Alvan Graham Clark used a process called figuring to grind and polish the lenses for his refracting telescopes. Figuring involves carefully shaping the lens surfaces to achieve the desired optical properties, ensuring high-quality and precise observations.
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