Referring to Fig. 10.52, integrate the expression dS = 2ÏÏ 2 sin Ï dÏ over the l

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Referring to Fig. 10.52, integrate the expression dS = 2πρ2sin φ dφ over the l th zone to get the area of that zone,

(21 – 1)A ro + λπρ A = p + ro 4

Show that the mean distance to the lth zone is

(21 – 1)A n = ro +

so that the ratio Al/rl is constant.

Fig. 10.52

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Optics

ISBN: 978-0133977226

5th edition

Authors: Eugene Hecht

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