prism binocular

noun

Definition of prism binocular

: 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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“Prism binocular.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/prism%20binocular. Accessed 27 Oct. 2020.

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