Completed in 1895, the Yerkes telescope operated by the University of Chicago remains the biggest (largest-diameter) refracting telescope ever built. Figure P26.55 shows a photograph of the telescope taken in 1921, when it was the most important astronomical instrument in the world. The refractor has an f-number of 19 and an objective lens that measures 1.02 m across. What are the focal length and approximate length of this telescope? Do your calculations agree with an estimate made from the photograph?