The change in direction of a beam of light as it travels from one material to another is called refraction. The normal is a construction line drawn at right angles to the surface of the glass block.

It is then refracted away from the normal at the boundary between glass and air as it leaves the prism.

A team of international scientists, led by researchers from the University of Otago, has introduced a groundbreaking method to improve the accuracy of prey size estimation using footage captured by ...