You Have a Choice Between Two Lenses of Focal Lengths $M _ { b } = M _ { a } / 4$

question 58

Multiple Choice

You have a choice between two lenses of focal lengths fa and fb, where fb = 2fa, to use as the objective lens in building a refracting telescope. If the magnification you obtain using lens a is Ma,
What will be the magnification when using lens b?

• A) \(M _ { b } = M _ { a } / 4\)
• B) \(M _ { b } = 2 M _ { a }\)
• C) \(M b = 8 M _ { a }\)
• D) \(M _ { b } = 4 M _ { a }\)
• E) \(M _ { b } = M _ { a } / 2\)

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