هو عبارة عن طلاء

هو عبارة عن طلاء

النتائج (الإنجليزية) 1:

A coating

النتائج (الإنجليزية) 2:

It is a coating

النتائج (الإنجليزية) 3:

He speed of light in a vacuum is always the same, but when light moves through any other medium it travels more slowly since it is constantly being absorbed and reemitted by the atoms in the material. The ratio of the speed of light in a vacuum to the speed of light in another substance is defined as the index of refraction (aka refractive index or n) for the substance.