Plane waves impinge perpendicularly on a screen with a small circular hole of radius R in it. It is found that when viewed from some axial point-P the hole uncovers 1/2 of the first half-period zone. What is the irradiance at P in terms of the irradiance there when the screen is removed? Look at Eqs. 10.54 and 10.55.

Transcribed Image Text:

|I(0) (10.54) 2R² 2/1(kaq/R)]2 kaq/R I = I(0) (10.55)