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If you are referring to visible light, which lies in the wavelength range

from 380 to 740 nm of the electromagnetic radiation spectrum, an opaque

body won't allow light to travel trough it. When light hits the surface of

the body the light can be, reflected, absorbed, or part of it reflected and

the rest absorbed.

In the case you are referring to thermal radiation which lies in the wavelength

range from about 1 x 102 to 1 x 105 nm, an opaque body to thermal

radiation will behave the same.

In this later case the way the body's surface will behave is given by the

surface properties reflectivity and absorptivity, which are the fraction of the

incident radiation that is reflected and absorbed by the surface respectively.

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13y ago

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