The spell sickening radiance states:
Dim, greenish light spreads within a 30-foot-radius sphere centered on a point you choose within range.
Wall of force states:
An invisible wall of force springs into existence at a point you choose within range.
Nothing can physically pass through the wall.
As the wall is "invisible", that means it is permeable to light. So the light of sickening radiance - and thus the effect of the spell - should be allowed to pass through. But the wall also stops anything from physically passing through it; would that apply to the photons of the sickening radiance (if, indeed, "light" in D&D terms is made of photons)? If not, why can the visible spectrum of light pass but the damaging, magic light of "sickening radiance" not?