A and B, are located at the similar distance from the observation screens. Light with the similar wavelength λ is used for each. The separation between adjacent principal maxima for grating A is 2.7cm, and for grating B it is 3.2 cm. Grating A has 1592 lines perimeter. How many lines per meter does grating B have? (Hint: The diffraction angles are small sufficient that the approximation sin(θ) ~ tan(θ) can be used.)