To examine the conditions under which the approximations of H3q. (9.23) are valid:
(a) Apply the law of cosines to triangle S1S2P in Fig. 9.8c to get
(b) Expand this in a Maclaurin series yielding
(c) In light of Eq. (9.17), show that if (r1, − r2) is to equal a sin θ, it is required that r1, >> a2/λ.
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