large auditoria, where even sound coverage and speech intelligibility is important: a. concave, reflective surfaces are usually useful because they can focus reflections and increase the level of direct sound at certain listener locations b. concave, reflective surfaces are usually problematic because they can focus reflections at certain listener locations c. it is usually best to make the rear wall of a material that is acoustically reflective because it can provide useful reflections to people sitting near the back d. it is usually best to provide

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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.