Numerical model of light propagation in sea water

Visible light has a narrow part of electromagnetic wave spectrum. There are two ways for studying light propagation in different media. One is the study of physical properties of light and its variations in a medium and the other is solving its equations. In the present the second method was chosen and Maxwell’s equations which describe electromagnetic waves nature were used to study the light propagationin different media. We applied a light beam normal to water and propagate straightforward which has a wave length about 6000 A. A Fortran program was used to solve the equations by finite difference method and the wave intensity was calculated using. Wave intensity profile showed that light beam intensity in water is very low and decays rapidly.