The Theory of Optics

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Hence 9-y __ $s fir __ QS x dx dr dx dr r' 9 __ 9f a r _ af y_ dy dr dy dr r' For since r 1 = x 2 + j 2 + ^ 2, partial differentiation gives , i. E. -- = = cos (rx\ fix r and similarly Also, Q S I (jS X - * ^ l~ * r\~ \ " 'N / o " r\ 9 I ^ V r 9/* ^ dr\r dr' r* dr* dr \r and similarly Equation (12) becomes, therefore, for this case + l*L\ (16) -f- r9r ; which may also be written in the form 172 THEORY OF OPTICS This equation has the same form as (13) save that rs replaces s, and r replaces x. T...he integral of (17) is therefore, by (14), rj=/1 (/ --)+/, (, + ). . . . (18) If, again, homogeneous light of period T be used, it follows that - COS 27t\ This is our former equation for spherical waves. One train of waves moves from the origin, the other moves toward it. The amplitudes, for example, are inversely proportional to r.
This result, which was used above on page 126 in defining the measure of intensity, follows from equation (12).
Before deducing Huygens' principle from equation (12) the following principle must be presented.


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