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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