數值孔徑 (Numerical Aperture, NA) 計算
Na = \frac {D} {2f}
解析度 (Resolution) 計算
Resolution = \frac {\lambda}{2NA}
截止頻率計算
f_0= \frac {D}{2 \lambda f}
f_0= \frac{1}{\lambda} \frac{D}{2f}
f_0= \frac{NA}{\lambda}
解析度與截止頻率關係
Resolution = \frac{1}{2f_0} = \frac{\lambda}{2NA}
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