You Have a Choice Between Two Lenses of Focal Lengths

question 23

Multiple Choice

You have a choice between two lenses of focal lengths f_a and f_b = 2 f_a to use as objective lens in building a refracting telescope. If the magnification you obtain using lens A is M_a, what will be the magnification when using lens B?

• A) M_b = 2 M_a
• B) M_b = 4 M_a
• C) M_b = 8 M_a
• D) M_b = M_a /4
• E) M_b = M_a /2

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Definitions:

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