Suppose light falls on double slits separated by 131 μm. Randomized Variablesd = 131 μm θ = 0.67° What is the wavelength of the light in nm, if the third-order maximum is at an angle of 0.67° ?

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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.