The present paper describes the results of an investigation of latent image formation and topography upon different types of exposure. The photographic emulsion used in this work have been prepared by a Sakura infra-red 750. The exposure have been made with light from a tungsten lamp and high pressure Hg-lamp. Latent image distribution was used as for the glycine-carbonate surface developer. And internal developer was prepared by adding sodium thiosulf ate to D-19 developer. As the bleacher for destruction of the surface latent image was used acid-dichromate solution. We obtained the distribution rate of latent image in the ultra-violet and infra-red regions, which was (D_I/D_S) _I.R>(D_I/D_S) _{U. V} in the intermediate intensity exposure and (D_I/D_S) _I.R-(D_I/D_S) _{U, V} in the low intensity exposure.