You are setting up an interference experiment that uses a 270 nm path-length difference and a laser with an unknown wavelength. If the two waves are 190 degrees out of phase, what is the wavelength of the laser light? (in nm) (a) 190 (b) 270 (d) 512 (e) 142 (f) 460

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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.