Binoculars denoted as 7 x 50 have a total magnification of
Binoculars denoted as 7 x 50 have a total magnification of 7 times and objective lenses of 50- mm diameter. What is the focal length of the eyepiece if the objective focal length is 25.5 cm?
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binoculars denoted as 7 x 50 have a total magnification of 7 times and objective lenses of 50- mm diameter what is the
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