Why Do Reflecting Telescopes Usually Have a Secondary Mirror in Addition

question 21

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 focal length
• D) to combat chromatic aberration

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Definitions:

Retrieval

The process of accessing and bringing into consciousness information stored in memory.

Stored Information

Data or knowledge retained in the mind or in digital/formal systems for future use.

Consciousness

A concept with many meanings, including sensory awareness of the world outside, direct inner awareness of one’s thoughts and feelings, personal unity, and the waking state.

Long-Term Memory

Long-term memory is the component of the memory system capable of storing large amounts of information for periods ranging from days to a lifetime.