Define the folowing a. spectral emissive power b. direct irradiation c. total radiosity d. diffuse surfaces

Explanation:

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 .

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