21.8 A dish antenna with a diameter of 17.2 m receives (at normal incidence) a radio signal from a distant source, as shown in the figure below. The radio signal is a continuous sinusoidal wave with amplitude Emax = 0.28 µV/m. Assume the antenna absorbs all the radiation that falls on the dish. (A dish antenna on top of a tall tower extending above the trees. The dish points upward and to the left. Three parallel wavy arrows come downward and to the right toward the dish.) (a) What is the amplitude of the magnetic field in this wave? T(b) What is the intensity of the radiation received by the antenna? W/m2(c) What is the power received by the antenna? W

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Interference of Light

The word "constructive" signifies addition in interference. Constructive interference occurs when the path of the waves that start from the slit differs by 1 entire wavelength or in the intervals of the same. Hence, the waves that are presented on the screen are in phase (crest to crest/trough to trough). The waves interfering constructively forms bright fringes on the screen.