The Theory of Optical Images. Bij Lord RaijlciijJi. 457 



Table I. 



same, as will happen when the illumination is by plane waves 

 incident perpendicularly ; (ii.) when the phases are opposite ; and 

 (iii.) when the phase-difference is a quarter period, which gives 

 the same result for the intensity as if the apertures were self- 

 luminous. The annexed table gives the numerical values required. 



Table II. 



