You did the same experiment double-slit experiment with an illustration board, but this time, you used blue light with wavelength of 480 nm. The distance between the slits is 3.0 cm and the screen is located 3.00 m from the illustration board. Find the distance between the central bright fringe and the third order dark fringe.

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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.