A set of narrow vertical slits is located a distance D from a screen. The slits are equally spaced and have the same width. The intensity pattern in the figure is observed when light from a laser passes through the slits, illuminating them uniformly. The screen is perpendicular to the direction of the light. a) What is the spacing between the slits? Data: Distance to the screen = 2.29 m; Wavelength of light = 0.420 μm; Distance between tick marks on b) If the slits' separation is increased by a factor of 2, what would be the distance between the principal peaks on the screen

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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.