Why Do Reflecting Telescopes Usually Have a Secondary Mirror in Addition

question 37

Multiple Choice

Why do reflecting telescopes usually have a secondary mirror in addition to a primary mirror?

• A) to increase the light-gathering power
• B) to make the telescope shorter
• C) to increase the magnification
• D) to eliminate the focal length
• E) to combat chromatic aberration

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Definitions:

Existential Import

The assumption within a proposition that something exists.

Square of Opposition

A diagram representing the logical relationships between certain types of propositions in classical logic.

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Pertaining to or being applicable to all cases, individuals, or groups without exception.

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A Venn diagram is a graphical representation using overlapping circles to illustrate the logical relationships between two or more sets of items.