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How does the idea of radiance as energy moving along a ray capture the “per unit area” part of this definition?


What does "energy along a ray" mean? I'm having trouble understanding what radiance measures.


I am also struggling with how the angle relates to this. Is the intuition that more photons hit at a perpendicular angle rather than a non-perpendicular angle?


it is different from the radiant flux that this radiance is same on different distances?