A physicist is calibrating a spectrometer that uses a diffraction grating to separate light in order of increasing wavelength (?A,?B, and ?C). He observes three distinct first-order spectral lines at the following respective angles ?m (where m denotes order). ?1 = 12.8°, ?1 = 14.2°, ?1 = 15.0° (a)If the grating has 3,760 grooves per centimeter, what wavelength (in nm) describes each of these spectral lines? at ?1 = 12.8° ?A= nm ?1 = 14.2° ?B= nm ?1 = 15.0° ?C=. nm (b) At what angle (in degrees) would each of these lines be found in the second-order spectrum? for ?A ?2= ° for ?B ?2= ° for ?C ?2= °

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A physicist is calibrating a spectrometer that uses a diffraction grating to separate light in order of increasing wavelength 
(?A,?B, and ?C). He observes three distinct first-order spectral lines at the following respective angles ?m (where m denotes order).
?1 = 12.8°, ?1 = 14.2°, ?1 = 15.0°
(a)If the grating has 3,760 grooves per centimeter, what wavelength (in nm) describes each of these spectral lines?
at ?1 = 12.8°    ?A=         nm
 ?1 = 14.2°       ?B=         nm
?1 = 15.0°        ?C=.        nm
(b)
At what angle (in degrees) would each of these lines be found in the second-order spectrum?
for ?A      ?2=   °
for ?B      ?2=    °
for ?C     ?2=   °
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