Discussion

Match the appropriate monocular depth cue with each example :

Example	Cues
(i) One building partly blocking another	(a) Motion parallax
(ii) Railroad tracks converging in the distance	(b) Linear perspective
(iii) Closure objects appearing to more faster than objects farther away	(c) Interposition
(iv) Objects further away looking smaller than near objects	(d) Relative size

Answer: A

The correct matching is (a)-(iii), (b)-(ii), (c)-(i), (d)-(iv).

(a) Motion parallax: closer objects appear to move faster than objects farther away (iii).
(b) Linear perspective: railway tracks converge in the distance (ii).
(c) Interposition: one building partly blocks another, so it is seen as nearer (i).
(d) Relative size: distant objects look smaller than near ones (iv).

The other options misplace at least two cues; the last, for instance, pairs interposition with converging tracks.

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