What are two conditions for minimum deviation in a prism?

The two conditions for minimum deviation in a prism are that the incident angle and the angle of refraction at the prism's surfaces must be equal, and the light ray must pass symmetrically through the prism. This occurs when the angle of incidence equals the angle of emergence, resulting in the light ray entering and exiting the prism at equal angles relative to the prism's base. Additionally, the angle of deviation is minimized when the light ray travels in a straight path through the prism's apex.