Why does a rectangular glass prism with equal edges rotate the rays falling on it?

Because the limiting angle for a glass prism is 42 “, so a ray falling on the face of the prism at an angle greater than 42 degrees will not come out of it, but will be reflected at the same angle.

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.