lens question

[theonlytycrane]

The given answer is (A). Both lenses have an index of refraction = 1.5. If the IOR of the eyepiece lens is increased, the bending of light may change, but I'm not sure how to relate this to magnification.

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[popopopop]

Thanks for the review for the morning. I never really learned lens in my physics course. Here's what I discovered mathematically.

1. Using the lensmaker's equation, you can see focal length is shorten by higher index of refraction
http://www.livephysics.com/problems-and-answers/optics/convergence-lens-focal-length-power/

2. Magnification for a telescope (any double lens?) is a ratio of Fobjective/Feyepiece.
http://www.rocketmime.com/astronomy/Telescope/Magnification.html