A physicist is calibrating a spectrometer that uses a diffraction grating to separate light in order of increasing wavelength (?A, ?B, and ?C). She observes three distinct first-order spectral lines at the following respective angles ?m(where m denotes order). ?1 = 12.6°, ?1 = 14.0°, ?1 = 15.3° (a) If the grating has 3,760 grooves per centimeter, what wavelength (in nm) describes each of these spectral lines? at ?1 = 12.6° ?A= answer in nm at ?1 = 14.0° ?B= answer in nm at ?1 = 15.3° ?C=answer in nm (b) At what angle (in degrees) would each of these lines be found in the second-order spectrum? for ?A ?2 = answer in degrees° for ?B ?2= answer in degrees° for ?C ?2= answer in degrees°

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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.