A Cassegrain Telescope Has a Primary Mirror with a 5-M

question 165

Multiple Choice

A Cassegrain telescope has a primary mirror with a 5-m diameter and a hole with a diameter of 5 cm through the primary mirror.By what percentage is the light-gathering power of the mirror reduced because of the hole?

• A) 0.01%
• B) 1%
• C) 20%
• D) 50%

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Definitions:

Closing Accounts

The process of finalizing all ledger accounts to prepare financial statements at the end of an accounting period.