A thin film that has a thickness of "t" and has an optical index of n > 1.5 is placed on a pane of glass which has an optical index of 1.5. Which of the following wavelengths of light will give destructive interference? Select all that apply.  MULTIPLE ANSWERS.     tn     2tn     3tn     4tn     5tn     6tn

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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.