Refracting Telescope: 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. Mb = 2 Ma
B. Mb = 4 Ma
C. Mb = 8 Ma
D. Mb = Ma/4
E. Mb = Ma/2
Answer: A
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