Far from the point source S of the electromagnetic wave, an infinite ideally reflecting screen AB is placed (figure). Using a vector diagram, find how the intensity of the reflected wave at point S will change if a disk CD is cut out of the screen with the center at the base of a perpendicular lowered from S onto the plane of the screen, and this disk is shifted towards the source by one twelfth of the wavelength. The area of the disk is one third of the area of the first Fresnel zone. How will the result change if you change

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