One can use parallax directly to determine the apparent position of the source of the final rays. All one needs is a position on two rays and the direction of the rays at those points. Using this data one can compute the position, x̄, where the rays will cross.
Using a minus sign with μ makes the calculation a little easier. Here's the plot from the last blog for review.
The calculation shows that the two final rays radiate from the image of the luminous source.
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