Final answer:
The Clark Refractor in Arizona is not specifically mentioned in the provided information. The largest refracting telescope in the world is the 40-inch diameter Yerkes telescope located at Lake Geneva, Wisconsin, and operated by the University of Chicago.
Step-by-step explanation:
The Clark Refractor in Arizona is not specifically mentioned in the provided information, so its size is not known. However, the largest refracting telescope in the world is the 40-inch diameter Yerkes telescope located at Lake Geneva, Wisconsin. It is operated by the University of Chicago.