REFLEXION AT SPHERICAL SURFACES. 91 will pass through this image; if the pencil be large there willbe no point through which all the reflected rays pass, in thiscase a point source of light will not have a point image. 53. To determine graphically the image of apoint formed by reflexion in a… … Fig. 66. cipal focus, 0 the centre of the sphere, OF A the axis. Let P be aluminous point not far off the axis, and let PQ be perpendicularto the axis ; we may treat PQ as a small object, the image ofwhich, formed by reflexion, is required. Draw a ray PR parallelto the axis meeting the mirror in R.…
Heat · Light
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