e object in such a way asto illuminate it all over, and afterwards to traverse the convexlens or combination of lenses by which the image is formed onthe screen; when a lamp is used as the source a concave mirroris placed behind it so as to reflect on to the condenser the rayswhich proceed… … 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…
Heat · Light
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