$egingroup$ can you make the title an ext descriptive? I'd prize the question, "Why execute shiny surface reflect an ext light than other surfaces" with, "because that's exactly how shiny is defined". $endgroup$
A clean metallic surface shows up shiny because it is showing light. The interaction is due to the conductivity the the surface ar of the metal.
You are watching: A shiny surface reflects less light than a matte surface.
When surface problems change, the reflectivity is reduced. For example, a clean aluminum surface is an extremely reflective, and also aluminum coatings are used on the ago side of mirrors; the glass protects the clean aluminum surface.
If the clean aluminum surface is exposed come air that will quickly oxidize. You have the right to test this by scratching or cutting any kind of thick piece of dull aluminum. The oxidized class is actually a good insulator, however is rather thin. The exact same holds for most other metals. If castle don"t tarnish, climate stuff gets on the surface.
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