. The microscope and its revelations. ave-length,l/nder these circumstances no objec-tive, however wide may be its aperture,can yield a complete or t;1rictt ml <it least one of the next diffracted rays,, or, in other words,one of the next maxima of second order. The range of dissimilarity. 1- ic;. 05. DIFFRACTION THEORY UNIVERSALLY APPLICABLE 75 is in this case confined to the proportion between the bright and thedark interspaces of the striation and to the appearnnce of the con-tours of the stria\ If not more than the said tiro rays of the total diffraction fan areadmitted, the dark and th
. The microscope and its revelations. ave-length,l/nder these circumstances no objec-tive, however wide may be its aperture,can yield a complete or t;1rictt ml <it least one of the next diffracted rays,, or, in other words,one of the next maxima of second order. The range of dissimilarity. 1- ic;. 05. DIFFRACTION THEORY UNIVERSALLY APPLICABLE 75 is in this case confined to the proportion between the bright and thedark interspaces of the striation and to the appearnnce of the con-tours of the stria\ If not more than the said tiro rays of the total diffraction fan areadmitted, the dark and the light intervals are always shown ofapproximately equal breadth, even if the real proportion of bothintervals differs much from 1:1; and the dark and bright stria? showalways gradually increasing and decreasing brightness; in otherwords, want of distinct contours. This phenomenon shows the typical picture of every regularstriation for the depiction of which not more than two diffractionrays can be utilised. For example, Amphipleura pellitdda, or anyother striation which is near to the limit of resolution for the opticalsystem in use, and, therefore, even with oblique light, brings onlyone diffracted beam into the objective. ii. Whenever a structure gives rise to a diffraction fan of
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmicrosc, bookyear1901
