| OCR Text |
Show 30 III. 1 Physical aspects The color of the of color vision. object is due to the combination an reflection of the incident light. part of it penetrates the medium other part reflected latter reflection. reflected rays, back. When light absorption faUs on and has its energy converted to The and material,· a with heat, a the· first phenomenon is called absorption and the The color of the object which beam of a of the depends result from the incident on the characteristics of the light modified by the absorption characteristics of the illuminated materials. The absorptance incident light. intensity of all to appear wavelengths be grey when the visible. leaves on owe the of varies with of the light by nearly they objects wavelengths substances substance a the wavelengths of the A substance is said to show general absorption if it reduces the the colors of most certain of are illuminated by in light preference an incident white to others. their color to the selective absorption in The spectrum. material has a et Such amount. substances light. However absoption; that is, absorption .of due to selective are same result of this Practically all colored some absorption part or is that the different energy distribution from the light parts of light that that falls other rare it. The reflection of light 1. Reflection 2. Reflection after the such be categorized into two kinds: from the outer surface. In the first case, surfaces can as some light has except solid from the outer surface has the penetrated for polished some dyes which same the material. have selective quality as metals and reflection, light reflected the illumination. This phenomenon : |
