An optical engineer is calibrating a spectrometer that uses a
diffraction grating to separate light in order of increasing
wavelength
(λA,
λB,
and
λC).
He observes three distinct first-order spectral lines at the
following respective angles
θm
(where m denotes order).
θ1 = 12.8°, θ1 = 13.9°,
θ1 = 15.3°
(a)
If the grating has 3,740 grooves per centimeter, what wavelength
(in nm) describes each of these spectral lines?
at θ1 = 12.8°
λA
= nmat θ1 = 13.9°
λB...