Final answer:
If an actor were to stand far upstage next to scenery painted in forced perspective, the result would be that the actor would appear dwarfed by the scenery, thus destroying the illusion of the perspective.
Step-by-step explanation:
If an actor were to stand far upstage next to scenery painted in forced perspective, the result would be that the actor would appear dwarfed by the scenery, thus destroying the illusion of the perspective. When using forced perspective, objects that are farther away from the viewer are painted smaller in size to create the illusion of depth. If the actor is standing far upstage, which is the furthest part of the stage from the audience, they would appear much smaller compared to the forced perspective scenery, breaking the illusion.
For example, if the scenery depicts tall buildings in the distance and the actor is standing next to them, they would seem much smaller than the buildings, making it unrealistic and disrupting the perspective effect.
Therefore, the correct answer is option 1) appear dwarfed by the scenery, thus destroying the illusion of the perspective.