The Principles And Methods of Geometrical Optics Especially As Applied to the T
The Principles And Methods of Geometrical Optics Especially As Applied to the T
James P C James Powell Cocke Southall
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CBT, a= the point of intersection of the secondary ray with the chief ray being designated in the diagram by the letter T. The magnitudes BT = t, ^BTB = \ may be regarded as the co-ordinates of the secondary ray with respect to the chief ray. This intercept t on the chief ray is measured always from the incidence-point B as origin, and is to be reckoned positive FIG. 121. Figure represents a pair of rays, lying in the plane of a principal section of a spherical refracting surface, and incident ...on this surface at the points designated by B and B. These rays cross the optical axis at the points designated by L, and L, and intersect each other at the point designated by T. The refracted rays are not shown. AL = v, AL = v, AC=r, BT= t, L BCB =x, ALB = 9, / ALB = 9, Z BTB = A. or negative according as the light travels along the straight line BT in the direction from B towards T or in the opposite direction. The "aperture-angle" X is defined as the acute angle through which the chief ray BT must be turned around the point T in order to bring it into coincidence with the secondary ray BT.
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