A point sruce s (波長 = 500nm) is placed 1m from an aperture
consisting of a hole of 1-mm radius in there is a circular opaque
obstacle whose radius is 1/2mm. The receiving point P is 1m from
the aperture.
What is the irradiance at P compared to the irradiance if the aperture
were removed.
這題是 Fresnel diffraction ??
只知道 I = Up ^ 2 ，L= [(R1)^2]/波長
等效焦距L是1m ?
其實不太懂這題如何起手
謝謝
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