As can be seen in the diagram the light ray changes direction as it enters and leaves the block. In all ray diagrams, all angles of incidence and refraction are measured between the ray and the ...

Light is refracted ... Just like ray diagrams showing reflection, all angles are measured from the normal – a line at 90° to the refracting surface. It is refraction that makes some objects ...

Brenden Sener admits there are challenges to his project but argues that the ancient descriptions could still be accurate.