By Donald L. Wise, Gary E. Wnek, Debra J. Trantolo, Thomas M. Cooper, Joseph D. Gresser

Furnishes the mandatory heritage info, equipment of characterization, and functions of optic and photonic structures in line with polymers. DLC: Photonics - fabrics.

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10, 1948, 150-153. "The New Candle" J. W. T. Walsh, W. Barnett, R. G. Berry andJ. S. Preston, Proc. Inst. Electr. Eng. JOB, 1961, 173-181. " *) Ph. T. R. = Philips Technical R

5 r2 According to formula (II-I) w = -. Fig. 6. The value of the conical solid angle of which the half-apex angle is ex rna y be expressed in terms of ex. e. h = CD). We may now write: w 5 = -r2 = 2n =- r 2nr . CD r2 (r- r cos ex) 2n = -(MD- MC) = r = 2n {1 -cos ex). 20 [II SOLID ANGLE A conical solid angle may thus be expressed by w = 2n (I -cos ex). 5". 0404 sterad. In the above we have defined the idea of "solid angle" as the space enclosed by a conical surface. Space can also be enclosed by hyo conical surfaces having a common apex; the space thus enclosed is also called a solid angle and the definition given in section II-I should be extended accordingly.

If the subtended part of the spherical surface is not equal to r 2, but may be denoted by 5, then 5 w=-. r2 (II-I ) The surface of a sphere of radius r is 4nr2 ; the solid angle enclosed by the whole sphere is thus Fig. 5. The solid angle w subtends at the surface of the sphere an areaS. When the radius of the sphere is denoted by Y and the subtended area is ,s, the solid angle is equa l to 1 steradian 4nr2 - - = 4n sterad. r2 Hence the half sphere contains 2n sterad. Example: A solid angle w subtends an area of 12 sq.

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