Segmented Mirrors Sag Under Their Own Weight

question 15

Multiple Choice

Segmented mirrors sag under their own weight. Their optical shape must be controlled by computer-driven thrusters under the mirrors in what is called

• A) an achromatic lens.
• B) active optics.
• C) a Schmidt-Cassegrain design.
• D) a Newtonian design.
• E) interferometry.

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The number of individuals or observations used in a study or represented in a statistical analysis.

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The process of defining and measuring variables in research in a way that they can be empirically tested.

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The specific, tangible aspect or stage of a process or phenomenon, often contrasted with abstract or theoretical levels.