The Prism Binocular
المؤلف:
GEORGE A. HOADLEY
المصدر:
ESSENTIALS OF PHYSICS
الجزء والصفحة:
p-484
2025-12-23
612
The insertion of the two converging lenses between the object glass and the eyepiece insures an upright image in the terrestrial telescope, but increases the absorption of light. The use of a pair of Porro prisms gives an upright image and shortens the tube of the instrument so that it can be used, in the form of a binocular, as an opera glass. Figure 1 represents such an opera glass, half in cross section. The arrow represents the path of a ray of light through the instrument. This ray is totally reflected from the inner surfaces of the prisms four times.
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