The incident ray is refracted towards the normal as it enters the glass prism from air. It is then refracted away from the normal at the boundary between glass and air as it leaves the prism.

Light is often thought to reflect from a flat surface at the same ... In our setup a beam is reflected by an air–glass interface and its transverse position is measured with a calibrated split ...

Discover the science behind mirrors and glass, from electron behavior to topological materials, explained by IIT Kanpur professor.