As the grazing angle is a function inversely proportional to photon energy, the higher-energy X-rays require smaller (less than 2 degrees) grazing angles to be focused.
The angle of incidence is fixed in the design of the aircraft, and with rare exceptions, cannot be varied in flight.
Kurt Angle | Angle Shades | angle | Small Angle Shades | An Angle | Sharron Angle | Ultra wide angle lens | Small-angle X-ray scattering | Small-angle scattering | Edward Angle | Degree (angle) | Angle Township, Lake of the Woods County, Minnesota | Angle Township | Angle of incidence | Variable-incidence wing | The Zenith Angle | Solid angle | solid angle | Slip angle | Site of Krasnokholmsky Bridges, 1853, from ''Khotev's Atlas''. Note the channel separating Red Hills (triangular island) and the angle of bridge across Moskva River | Northwest Angle | Guichard d'Angle | degree (angle) | Costovertebral angle tenderness | Costovertebral angle | camera angle | Brewster's angle | Angle#Types_of_angles | Angle of repose | Angle of loll |
They also maintain the correct angle of incidence for the connected wing panels and are often braced with wires.