Under what conditions does the direction of propagation of electromagnetic waves change at the interface between two media?

Provided that the speed of propagation of waves in these media are different and If the wave hits the surface at an angle greater than 0 °.

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.