axiom. 1  a self-evident truth that requires no proof. 2  a universally accepted principle or rule. 3  Logic, Mathematics. a proposition that is assumed without proof for the sake of studying the consequences that follow from it.
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1 - Ojective lens 2 - Schmidt-Pechan prism 3 - Eyepiece. A monocular is a modified refracting telescope used to magnify the images of distant objects by passing light through a series of lenses and usually prisms, the application of prisms resulting in a lightweight, compact telescope.