A professor shipwrecked on hooligans island decides to, Ask an Expert

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A professor shipwrecked on Hooligan's Island decides to build a telescope from his eyeglasses and some coconut shells. Fortunately, the professor's eyes require different prescriptions, with the left lens having a power of 4.9 diopters and the right lens having a power of 1.7 diopters.

A) Which lens should he use as the objective?

B) What is the absolute value of angular magnification of the professor's telescope? Thanks in advance!

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