A ray diagram showing refraction at the boundary between air and glass Refraction can cause optical illusions as the light waves appear to come from a different position to their actual source.

These optical illusions are created by the refraction of sunlight through ice crystals in the atmosphere. For a sun dog to form, there must be hexagonal ice crystals in the sky that float parallel ...

The reflection and refraction of light explains how people see images, colour and even optical illusions. Lenses - Edexcel Lenses are precisely shaped pieces of glass that have been developed and ...