The Proceedings of the Optical Convention 1912 Held At South Kensington June
The Proceedings of the Optical Convention 1912 Held At South Kensington June
England Optical Convention 2nd 1912 London
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Next, let the focus of the eye be drawn back towards the focal plane, and suppose that a halt is made at the isophasal / 3 -/ 4 . The conditions of image formation are obviously unchanged, save in one respect, namely this, that the light amplitude is increased in the proportion of ^4^ S ! (M4- We find, accordingly, that the breadth of the image produced by radius of (/ ? -/ 4 ) diffraction in this place is less, and its brightness greater, but its characteristic features are unaltered. If we su...ppose the aperture of the aplanatic pencil to be square in section, we shall obviously obtain four such Fresnel patterns arranged as sides of the square (see photographic plate B) ; and since the characteristic feature of such a pattern is a group of parallel bands arranged about a centre of figure, I propose to speak of this as a pattern of the annular type. If the polygon be one having very numerous sides, then the pattern becomes indistinguishable from a system of oval bands, if the word " oval " is used in a sense large enough to include the circle.
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