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Prism Binoculars

Prism binoculars consists of two astronomical telescopes each containing two totally reflecting right angled prisms. In this way the distance between the objectives of the telescopes is made larger than the distance between the two eyes, thus increasing the field of view and the stereoscopic effect pertaining to distance. Moreover, the effective length is made ½ of the length of the telescope to be used for the same magnification and the final image is also erect.

The prism A is placed with its refracting edge horizontal while the prism B is placed with its refracting edge vertical. In an astronomical telescope the final image formed is inverted.

The objective and the eyepieces are convex lenses. The prism A turns the image in the vertical direction upside down. The prism B turns the image in the horizontal direction. The image produced after reflection is erect and magnified. The optical path is about three times the length of the binocular. Therefore, it works as an astronomical telescope equal to three times its length.