Coherent light of wavelength 400 nm is incident on a single slit of width 0.010 mm. A screen is placed 7 m behind the single slit. Unlike most of the examples in class, this screen has a fixed height of 4 m and is centered on the optic axis a.) Find the total number of dark fringes on this fixed height screen. b.) Suppose the intensity of the incident light is 1 W/m2. Find the intensity near the top edge of the screen.

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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.