2. A neon sign emits electromagnetic radiation with a wavelength of 6.4 x10^-7 m . A) calculate the frequency of the electromagnetic radiation B) if the neon was located 25 m from the observer , how long would it take the light from the neon sign to reach the observer ?

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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.