Yes, the laws that are valid for plane refracting surfaces can also be applied for spherical refracting surfaces. The laws of refraction are as follows: (i) The incident ray, the refracted ray and the normal to the surface of separation of two media at the point of incidence, all lie in the same plane. (ii) The ratio of sine of angle of incidence 'i' to the sine of angle of refraction 'r' is a constant. This constant is called the refractive index of the material of the prism. Thus, angle of incidence 'i' and the angle of refraction 'r' are related as       
(sin i /sin r) = n₂₁
where n₂₁ is a constant, and is called the refractive index of the second medium with  respect to the first medium.