Decollimation may be deliberate for systems reasons , or may be caused by many factors , such as refractive index inhomogeneities , occlusions , scattering , deflection , diffraction , reflection , and refraction .
Decollimation may be deliberate for systems reasons , or may be caused by many factors , such as refractive index differences , occlusions , scattering , deflection , diffraction , reflection , and refraction .