A System of Applied Optics Being a Complete System of Formul of the Second Or
A System of Applied Optics Being a Complete System of Formul of the Second Or
H Dennis Harold Dennis Taylor
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S being positive or an addition to the value 228 A SYSTEM OF APPLIED OPTICS Universal formula for the angular value of the coma proper. Formula for angu- lar value of both sorts of coma. Of v . This would certainly be the case if, for instance, x= + 1 and a or '5 ; but as we have laid down the rule that inward coma is to be considered negative and outward coma positive, we must prefix the negative sign to the above formula as shown. Next, if we divide by V we shall then obtain the angular value... of the coma as viewed from the lens centre, getting finally XIX - Q jy ' W VLi ~ A ~ ^. TT 7~ On comparing this result with Formula II. , formerly arrived at for the angular value of the coma for the lens at open aperture, we find that the two formulae are identical, although A is now eccentric ; that is, for a given pair of conjugate focal planes and a given degree of obliquity the angular value of the coma is simply a function of the square of the semi-aperture of the pencil where it is refracted, and is quite independent of the degree of eccentricity of the pencil where it traverses the lens, and therefore of the distance of the stop from the latter.
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