A plane light wave with wavelength \( \lambda \) and intensity \( I_{0} \) falls normally on a l...
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0A plane light wave with wavelength \( \lambda \) and intensity \( I_{0} \) falls normally on a large glass plate whose opposite side serves as an opaque screen with a round aperture equal to the first Fresnel zone for the observation point \( P \). In the middle of the aperture there is a round recess equal to half the Fresnel zone. What must the depth \( h \) of that recess be for the intensity of light at the point \( P \) to be the highest? What is this intensity equal to?
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