Light from a He-Ne laser of wavelength is 633 nm passes through a circular aperture of diameter 114 mm. The width of the central maximum on the screen is 54.2 mm. How far is a screen from the circular aperture? A. 1.54 m B. 4.88 m C. 8.00 m D. 9.76 m E. 4.00 m

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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.