That was a really nice illustration. It clarified the question asked in the
previous post quite well. Thanks!

I hope you can help with another small clarification. You mentioned to udyank
previously that the virtual aperture plane could indeed be anywhere and could
also thus be at the plane of the lens. But in your illustration, isn't there a
change in direction of the ray between say Q1' and P1 because of the presence of
the lens in between? Wouldn't it be incorrect to assume a ray straight from Q1'
to P' without tracing the deviation caused due to refraction?

If we were to assume that the virtual aperture was actually at the location of
the (thin-)lens , then does this jittering exactly correspond to simulating a
thin-lens by tracing multiple points on the lens and shooting rays towards P' on
the object side and towards P on the image side?

Again, thanks a lot for your explanation. It has really helped understanding the
focal blur pipeline of POVRay.

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