Huyegenian Eyepiece Diagram Showing Lens Refraction

| View Cart ⇗ | Info

“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


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


TIFF (full resolution)

2400×1110, 218.6 KiB

Large GIF

1024×473, 34.2 KiB

Medium GIF

640×296, 17.6 KiB

Small GIF

320×148, 6.9 KiB