Under symmetric refraction of light through a prism, how does the refracted ray appear with respect to the base of the prism?

For the refraction of light through a prism

In refraction of light through a prism the light ray:

Refraction and Dispersion of Light through Prism

Draw the ray diagram to show the refraction of light through a prism.

When a monochromatic ray of light is passed through an equilatorial glass prism , it is found that the refracted ray in glass is parallel to the base of the prism . If i and e denote the angles of incidence and emergence respectively then