The fringe width b is defined as the distance between two consecutive maxima (or consecutive minima). In a Young’s double-slit experiment, the fringe width obtained from a source of wavelength 500.0 nm is 3.90 mm. If the apparatus is immersed in a liquid that has index of refraction n = 1.30, what is the new fringe width? Assume the apparatus was originally in air and that the small-angle approximation applies to this situation.

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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.