Light entering a thin metallic film has approximately equal intensities of extreme red ( =700 nm in

Light entering a thin metallic film has approximately equal intensities of extreme red ( λ=700 nm in vacuum) and extreme blue ( λ=400 nm in vacuum) light. The intensity of the red light decreases by a factor of ten after penetrating 10 nm of the film. By how much has the intensity of the blue light decreased after penetrating this distance? By how much has the intensity of the red and blue light waves decreased after penetrating 20 nm?