The Objective Lens of the Yerkes Telescope (The Largest Functioning

question 42

Multiple Choice

The objective lens of the Yerkes telescope (the largest functioning refracting telescope in the world) has a focal length of 19.4 m.If its eyepiece has a focal length of 2.5 cm, what is the magnitude of its magnification?

• A)7.8
• B)13
• C)130
• D)780
• E)cannot be calculated without knowing the length of the telescope

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