Fringes in the Thomas Young experiment are produced using sodium light of wavelength 410 nm and two slits which are 1.2 mm apart. If the fringes are formed on a screen 1.5 m away from the slits, how far is the third order bright fringe from the middle of the screen? Give your answer in millimeters (mm).

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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.