The 200-inch-diameter objective mirror of the reflecting
Chapter 19, Problem 48GP(choose chapter or problem)
Problem 48GP
The 200-inch-diameter objective mirror of the reflecting telescope at the Mt. Palomar Observatory has a focal length of 17 m.
a. The f-number of a mirror is defined exactly the same as the f-number of a lens. What is the f-number of this mirror?
b. The f-number of the 200-inch telescope is well within the range of f-numbers of a cheap camera. So why not just use the camera to take pictures of distant galaxies, instead of constructing this very expensive telescope?
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