Will a convex lens be collecting or scattering if the refractive index of its material is less than the refractive index of the environment?

If the refractive index of a convex lens is less than the refractive index of the environment, then such a lens will be scattering.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.