The red light emitted by a He-Ne laser has a wavelength of 633 nm in air and travels at 3.00 × 108 m/s. Find the frequency of the laser 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.