How far should a 6 inches object be located from the light source to create a 2 feet shadow on the screen 3 feet away?

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A: Electric potential = 14πε0×Qr

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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.