Which is true when a monochromatic light passes through a double-slit? Select one: a. Two waves will reinforce each other called as central bright fringe. b. All of them c. Light will coherent constructively or destructively at different points. d. Light will be diffracted showing a pattern of dark and bright fringes.

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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.