. A text book of physics, for the use of students of science and engineering . ay and thenormal, it would be to one side or the other of this plane, but thesymmetry of the arrangement would prevent us choosing one siderather than the other. The wave theory of light also leads to thefirst law. And further, it may be taken as the result of experience,as the whole of our optical work depends upon its truth. Image in a plane mirror.—Consider a luminous object situated infront of a plane mirror, such as a piece of silvered plate glass, shownin section at AB (Fig. 499). Any point S, of the source, e


. A text book of physics, for the use of students of science and engineering . ay and thenormal, it would be to one side or the other of this plane, but thesymmetry of the arrangement would prevent us choosing one siderather than the other. The wave theory of light also leads to thefirst law. And further, it may be taken as the result of experience,as the whole of our optical work depends upon its truth. Image in a plane mirror.—Consider a luminous object situated infront of a plane mirror, such as a piece of silvered plate glass, shownin section at AB (Fig. 499). Any point S, of the source, emits lightin all directions. One of the rays, such as SC, is reflected along CD,making the angle of reflection LCD equal to the angle of incidence ray SE is similarly reflected along EF. It will be observedthat all the rays, after reflection, diverge from one and the samepoint S behind the mirror. An eye situated so as to receive someof these reflected rays will therefore see the bright point at is said to be the image of S, and every point upon the bright. FIG. 498.—Optical disc.(A. Gallenkamp & Co., Ltd.) 554 LIGHT CHAP.


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Keywords: ., bookcentury1900, bookdecade1910, bookpublishe, booksubjectphysics