Fig. 104.focus the image distinctly on the screen. 86. The Camera Obscura. The principle of this isshewn in fig. 105. AB represents a plane mirror or a largeright-angled prism with its reflecting face at 45° to thevertical. Light, from a distant object, falling on this is re-flected vertically on… … Fig. 105. The mirror and lens are placed in the roof of a darkenedchamber, and the focal length of the lens is such that a realimage of the object is produced on a white table placed below. 85-87] OPTICAL INSTRUMENTS. THE EYE; VISION. 141 The mirror can be turned round the vertical and, as this…
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