It depends on properties of the material (refractive index), the size of the particle, and the wavelength of the incoming radiation.
ɪt dᵻpˈɛndz ˌɔn pɹˈɑːpɚɾiz ʌvðə mətˈɪɹiəl ɹᵻfɹˈæktɪv ˈɪndɛks, ðə sˈaɪz ʌvðə pˈɑːɹɾɪkəl, ænd ðə wˈeɪvlɛŋθ ʌvðɪ ˈɪŋkʌmˌɪŋ ɹˌeɪdɪˈeɪʃən.