Scattering is reduced by using an anti-scattering grid. The most important parameter to determine performance of the grid is the "grid ratio", defined as H/(D-t) (typically varying between 4:1 and 12:1 for radiographic imaging). If H=6 cm, D = 1.2 cm and the grid ratio is 6, calculate the minimum and maximum angles of the X-rays that can reach the film.