The following diagram shows the wavefronts for the case in which the distance between the centers of the slits is 3). X- Barrier with two slits Dowel passing through two identical very narrow slits Top-view diagram of water waves At how many points along the line segment X-X' in the diagram above is there complete destructive interference and maximum constructive interference? Mark the approxim locations of all of these points on the diagram above, and label each point with the corresponding value of A.D. Assume that the tank is very wide and that the line X-X' is ver from the slits.

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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.