Lecture 16: Camera & Lenses Cont. (33)

I am confused by the significance of the "a" variable; I understand that we are integrating across all the rays that could contribute to the power of the x' pixel, but I don't see how the "a" variable relates to the equation.


daniel-man the a and r are not explicitly present in the equation but they affect θ\theta' and θ\theta''

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