The first rainbow of multilayer spheres is studied, whose profiles of the refractive index are exponential decrease or increase by using generalized Lorentz-Mie theory of multilayer sphere.

• 利用广义洛伦兹米氏理论,研究了多层球折射率按指数规律变化时,其一阶彩虹角分布随折射率变化的情况。