The blue wave and the red wave are allowed to mix and produce the green wave, as shown above. What is present? I. Constructive Interference II. Deconstructive Interference A. II only B. Neither I or II C. Both I and II

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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.