The following conditions are necessary in order for interference of light tooccur, EXCEPT one. Which one is it? a. Light should be of a single wavelength. b. Light waves should be in-phase. c. Sources of light must be in the same state of polarization. d. Source of light and screen must be very near 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.