A double slit device has and unknown slit spacing, d. When light of wavelength 11 =539nm is used, the third interference maximum appears at an angle of 2.6°. When light of an unknown wavelength 12 is used, the second interference maximum appears at an angle of 17.1°. Determine the unknown wavelength

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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.