The optical transmittance and transmission coefficients for these films given in table 1 show that these parameters increased with increasing wavelength from 300 nm up to about 800 nm. From this point, these parameters were found to decrease with wavelength. Tables 1, 2 and figs. 1-3 also show that the parameters decreased with increasing thickness of films. For example, maximum visible transmission coefficient for Snl2 film with a thickness of 5.2×10-9m is 9.6x106m-1, that for a thickness of 11.7×10-9m is 8.8×106 m-1 while for a thickness of 16.7×10-9m; it is 9.0x 106 m-1. The values of transmission coefficients for Snl2 films of thickness 11.7×10-9is from 2.7 to 4.7 x o6 m-1 in the UV and from 6.5 to 4.7 x 106m-1 in the NIR. The values of the transmission coefficients for MnBr2 and FeCl2 follow this pattern. High values of radiation transmission coefficients in any region indicate high transmittance (transparency), whereas low values indicate opacity of the films in that region. Thus, the high values of these parameter in the VIS region indicates that the films are highly transparent to visible radiation while the low values of the parameters in the UV and NIR show that the films are opaque in these regions.