Huyegenian Eyepiece Diagram Showing Lens Refraction

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“They have also a shorter focus for red, and a longer one for blue, and thus magnify the red image more than the blue; and as the objective gives a large blue and small red image, the two cancel one another and a colourless image is produced.” —Encyclopaedia Britannica, 1910

Source

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

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