Example: Unpolarized light, intensity Io, falls on two polarizing sheets. The angle between two pola rizing sheets is 45. find the transmitted intensity I 自然光 solve =(10)c0s2a=l0c0s245 l0()2= 202P1 P2  cos 45 2 1 ) cos 2 1 ( 2 0 2 0 I = I  = I Example：A unpolarized light, intensity I0 , falls on two polarizing sheets. The angle between two pola￾rizing sheets is 450 . Find the transmitted intensity I. 0 2 0 4 1 ) 2 2 ( 2 1 = I = I solve： 0 4 1 I I 自然光 0 I0 /2