Cbuckley 462×184×0 (1207 bytes) SVG image showing decreasing aperture sizes. English Diagram of decreasing apertures, that is, increasing f-numbers, in
wikipedia. 2007-12-03 13:58 User A1 580×200 (52643 bytes) [[SVG]] Illustration of the Numerical aperture for an Optic fibre. Interior of the fibre is causing