Monochromatic, coherent light is incident on a pair of very narrow slits. The first order bright spot (m=1) occurs for an angle of 22 degrees as measured from the central bright spot. Which of the following angles best describes where the second order bright spot (m=2) would occur? a) at an angle slightly larger than 44 degrees b) at exactly 44 degrees c) at an angle slightly less than 44 degrees

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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.