(III) A nearsighted person has near and far points of 10.6
Chapter 25, Problem 21P(choose chapter or problem)
The 300-meter radiotelescope in Arecibo, Puerto Rico (Fig. 25–33), is the world’s largest radiotelescope, but many other radiotelescopes are also very large. Why are radiotelescopes so big? Why not make optical telescopes that are equally large? (The largest optical telescopes have diameters of about 10 meters.)
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