Question: Establish that at near-normal incidence the equation is a good approximation. [Use the results of the previous problem, Eq. (4.43), and the power series expansions

Establish that at near-normal incidence the equation

(n - n + 1 [le; -0 п

is a good approximation. [Use the results of the previous problem, Eq. (4.43), and the power series expansions of the sine and cosine functions.]

tan (0; – 0) (4.43) tan (0; + 0) %3|

(n - n + 1 [le; -0 tan (0; 0) (4.43) tan (0; + 0) %3|

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