§10.6 Photochemistry 6.1 Brief introduction of light 1: intensity of light, 4)Interaction between light and media d I adx x: the thickness of the medium a: the absorption coefficient absorption Light transmission I=loxp(ax) beam Lambert’slaw Reflection Scattering refraction I=lo[1-expax)] d Beer’slaw: lo exp(-acx4) Interaction between light and media exp( ) I = I0 −ax adx I dI − = [1 exp( )] I I0 I I0 ax a = − = − − I: intensity of light, x: the thickness of the medium, a: the absorption coefficient. 6.1 Brief introduction of light Beer’s law: 0 exp( ) a I I cx = − Lambert’s law §10. 6 Photochemistry Light beam