Which of the following is TRUE regarding constructive interference of light waves? The source and screen must be close to each other. The interfering sources must be far from each other. The source of light must be big enough. The intensities must be nearly equal to each other.

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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.