Dorian drove his wife to the airport so she could attend her business trip. What explains his understanding that the actual airplane is not getting smaller and smaller as he sees the airplane take off and fly high into the sky?

SIZE CONSTANCY.

Explanation: Size constancy can be defined as the tendency to perceive the real size of a familiar object despite differences in their distance (and consequent differences in the size of the pattern projected on the retina of the eye).

Size constancy is what makes his understanding that the actual airplane is not getting smaller and smaller as he sees the airplane take off and fly high into the sky.

Size Constancy

Explanation:

Size constancy can be defined as the way in which a person think that the size of an object are relatively constant despite the fact that the size of objects on the retina vary with distance such person perception about that object's size will still remain regardless of the changes in distance due to the fact that the person perception of image is still based upon the actual size of the object they saw which is why a SIZE CONSTANCY personality will often perceive an object as being the same size regardless of whether it is close or far away from them.

i believe your answer is mountains.