A passenger looks from a coach window while it travels through farmland. Fence posts close to the road seem to move rapidly backwards, but distant hills see...
Question 1 Report
A passenger looks from a coach window while it travels through farmland. Fence posts close to the road seem to move rapidly backwards, but distant hills seem to move slowly. The passenger uses this information to judge the coach's movement.
(a) Name the monocular cue described. [1]
(b) Explain why the fence posts and hills appear to move at different speeds. [3]
Answer Details
(a) Motion parallax [1] (b) As the observer moves, nearby objects create a larger change in visual position [1]; distant objects create a smaller change in visual position [1]; the brain interprets the faster apparent movement as meaning the fence posts are closer [1].
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