Optical Position and Size of Image Through Magnifying Glasses

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“If y be the object the image appears to a normal eye situated behind the system L with passive accommodation at a very great distance under the angle w’. Since H’ P= F O, = y, from the focal length of the simple microscope is the image side focal length.” —Encyclopaedia Britannica, 1910

Source

Encyclopaedia Britannica (11th ed., vol. 18) (New York, NY: The Encyclopaedia Britannica Company, 1910)

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