Elements of natural philosophy (Volume 2-3) . suppose this ray to have proceeded originally from F1;and denoting the distance from the new vertex 0\ tothe point F\ in which this ray, after deviation at thesecond surface, meets the axis, by /, and the index ofrefraction of the second medium by m\ we shall havefrom Equation (20), Equationapplicable to thesecond deviation; w! — 1 / + m! r m! (/ + t) • • (21) Second deviatedray incident upona third surface;. And by the same process for a third deviating surface. Equationapplicable to thethird deviation; 1 m tt m r + m (/ + f) . . (22) ELEMENTS OF
Elements of natural philosophy (Volume 2-3) . suppose this ray to have proceeded originally from F1;and denoting the distance from the new vertex 0\ tothe point F\ in which this ray, after deviation at thesecond surface, meets the axis, by /, and the index ofrefraction of the second medium by m\ we shall havefrom Equation (20), Equationapplicable to thesecond deviation; w! — 1 / + m! r m! (/ + t) • • (21) Second deviatedray incident upona third surface;. And by the same process for a third deviating surface. Equationapplicable to thethird deviation; 1 m tt m r + m (/ + f) . . (22) ELEMENTS OF OPTICS 193
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