A two-slit interference-diffraction pattern is observed using light with an unknown wavelength. The slits have a separation of 0.1500 mm and an unknown width. (a) The first interference maximum occurs at θ=0.1857∘. Calculate the wavelength of light.

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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.