A perfectly diffuse, or Lambertian, surface has the form of a square, 5 cm on a side. This object radiates a total power of 25 W into the forward directions that constitute half the total solid angle of 47π. A camera with a 4-cm focal length lens and stopped down to f/8 is used to photograph the object when it is placed 1 m from the lens.
a. Determine the radiant exitance, radiant intensity, and radiance of the object. (See Table 1-1.)
b. Determine the radiant flux delivered to the film.c. Determine the irradiance at the film.
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