A person is designing a 10x telescope if the telescope is
A person is designing a 10X telescope. If the telescope is limitedto a length of 20 cm, what is the approximate focal length of the objective?
A) 16 cmB) 17 cmC) 18 cmD) 19 cm
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a person is designing a 10x telescope if the telescope is limitedto a length of 20 cm what is the approximate focal
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