. Perspective for art students . of suns direction, wehave a vertical line near at hand with the actual light atone end and the foot or seat of the light at the sections will not be parallel, but will radiate fromthe seat of the light, but this makes no difference. 59. Reflections. Reflections fortunately do not give much trouble. Areflection is an image, and an exact image, of the objectreflected. It is the exactness of the similarity whichmakes the procedure simple, for the draughtsman hasalready all the points needed for the vanishing and 174 Perspective measuring of the original
. Perspective for art students . of suns direction, wehave a vertical line near at hand with the actual light atone end and the foot or seat of the light at the sections will not be parallel, but will radiate fromthe seat of the light, but this makes no difference. 59. Reflections. Reflections fortunately do not give much trouble. Areflection is an image, and an exact image, of the objectreflected. It is the exactness of the similarity whichmakes the procedure simple, for the draughtsman hasalready all the points needed for the vanishing and 174 Perspective measuring of the original object, and these serve again;or, if they do not serve, the new points are very easilyfound from the old ones, and do not have to be found bya laborious process. The law upon which our methods of finding reflectionsare based is this: The angle of incidence is equal to theangle of reflection. So that angle ABC, Fig. 129, isequal to angle DBE. If we make underneath the objectin Fig. 129 a similar object reversed, we have EF equal. Fm. 129.—The theory of refleetioBS. to ED, and the triangle EFB equal to EDB; so thatangle FEE will equal angle DBE. In a word, ABF willbe in a straight line, and it will be as though the spec-tator saw a second image reversed immediately below thefirst, the dividing-line being the mirror—in this case asheet of water. Vertical lines are simply reversed. Thus the tree inFig. 130 has its foot on the level of the mirror (let ussuppose). Vertically down from the foot of the tree wecan put the height of the tree, and so get its reflection. Reflections 175 This is done throughout Fig. 130. Care must, of course,always be taken to reverse the measurement from thelevel of the mirror and not merely the foot of the object,unless the two coincide. Thus in Fig. 131 the edge ofthe building is not on the water-level. It has, therefore,to be dropped to that level, and the bank is represented
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