physics

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A reflection grating is required which can resolve wavelengths as close as 0.002 nm in second order for the spectral region around 350 nm.The grating is to be installed in an instrument where light from the entrance slit is incident normal on the grating. If the manufacturer provides rulings over a 10 cm grating width, determine
a) the minimum number of grooves/cm required
b) the optimum blaze angle
c) the angle of diffraction where irradiance is maximum

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