S- size A- attitude L- location T- type refraction: phenomenon that often occurs when waves travel from a medium with a given refractive...

-Energy that travels in a straight line through space. -Light energy is transfered through radiation. -Radiation is a method of energy...

The iris: the coloured part of the eye. opens and closes around a central hole to let in more or less light in. The Pupil: the hole in...