Question: A certain luminous surface obeys Lambert's law. Its luminance is equal to L. Find: (a) The luminous flux emitted by an element AS of this

A certain luminous surface obeys Lambert's law. Its luminance is equal to L. Find:
(a) The luminous flux emitted by an element AS of this surface into a cone whose axis is normal to the given element and whose aperture angle is equal to θ; (b) The luminosity of such a source.

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