Define the folowing a. Spectral Emissive Power b. Direct irradiation c. Total Radiosity d. Diffuse Surfaces

a. Spectral Emissive power -

Spectral emissive power is the radiating emissive power about a partiular wavelength, is called the spectral emissive power.

b. Direct irradiation -

Direct irradiation is defined as the radiation travelling along a straight line from the Sun, down to the surface of the Earth.

c. Total Radiosity -

Total radiosity is defined as a radiant energy leaving a surface per unit time.

d. Diffuse Surfaces -

A diffuse surface is one where each part on the surface is at different levels and, after reflection, from the diffuse surface, the light ray are not parallel to each other but are at different angle.