Question: Expression for aperture efficiency in terms of physical aperture Ae and effective aperture Aem is __
Options
A : \frac{A_e}{A_{em}}
B : \frac{A_{em}}{A_e}
C : \frac{A_e+A_{em}}{A_e-A_{em}}
D : \frac{A_e-A_{em}}{A_e+A_{em}}
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