If the wavelength or red light in air is 690nm and remembering frequency does not change from medium to medium, what is the wavelength of the red light in the n=1.6 medium? (quantitative- show your work)

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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.