Which one of the following effects is not produced by interference?   a. Newton's rings   b. The spectrum of color seen using a prism   c. Iridescent feathers   d. The spectrum of color seen on a soap bubble

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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.