How are the Keck telescopes on Mauna Kea designed to work?
A) A single, thin primary mirror that has a 20-m diameter has its shape changed and controlled by a computer.
B) The light from two 10-m telescopes, which are 85 m apart, will eventually be combined into a single image.
C) A dish of mercury 100 m in diameter is rotated and thus forms a very large parabolic mirror.
D) Six thin mirrors with diameters of 10 m are arranged in a circle to simulate a single mirror with a diameter of 30 m.
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