1. What is the frequency (wavenu What is the frequency (wavenumber) of 1100 nm light of in cm-1, the units used in IR spectroscopy?mber) of 1100 nm light of in cm-1, the units used in IR spectroscopy?

2. An echellette grating that contains 1450 blazes /mm was irradiated with a polychromatic beam at an incident angle 48 to the grating normal. Calculate the wavelengths of radiation that would appear at an angle of reflection of 0 for 1st and 2ndorder of reflection.