Light containing two different wavelengths passes through a diffaction grating with 1.100 slits/on, On a soreen 14.0 cm from the grating, the third-order maximum of the shorter wavelength fals midway between the central maximum and the first side maximum for the longer wavelength. If the neighboring maxima of the longer wavelength are 844 mm apart on the screen, what are the wavelengths in the light? (Hint: Use the small angle approximation.) nm (longer wavelength) nm (shorter 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.