prism binocular

prism binocular
noun
: a binocular with shortened telescopic tubes in each of which light rays entering through the objective lens are reflected by two Porro prisms before passing through the eyepiece where finally an erect virtual image is formed — often used in plural; compare field glass

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Usually, prism binoculars. Optics. binocular (def. 1).

Useful english dictionary. 2012.

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Look at other dictionaries:

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