The Secondary Mirror of a Telescope Whose Primary Mirror Is

question 121

Multiple Choice

The secondary mirror of a telescope whose primary mirror is 4 m in diameter has a diameter of 0.5 m. What fraction of the incoming light is obstructed by this secondary mirror?

• A) about 1.6%
• B) about 1/8, or 12.5%
• C) about 35%
• D) about 16%

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