Double Slit 2 A laser with wavelength d/8 is shining light on a double slit with slit separation 0.400 mm . This results in an interference pattern on a screen a distance L away from the slits. We wish to shine a second laser, with a different wavelength, through the same slits. Part A: What is the wavelength λ2 of the second laser that would place its second maximum at the same location as the fourth minimum of the first laser, if d= 0.400 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.