Match List I with List II:

Llist I	List II
(A) Motion Parallax	(I) Both eyes fixate on the same point in space
(B) Texture Gradient	(II) Partial occlusion of a far object by a near object
(C) Interposition	(III) Graded variation in the shape, size and density of the surface elements
(D) Convergence	(IV) Movement in one part of the image relative to another

Correct option is B

Depth Perception and Its Cues

Depth perception refers to the ability to perceive the world in three dimensions (3D) and to judge the distance of objects. It relies on the integration of several cues, which are divided into monocular cues (requiring one eye) and binocular cues (requiring both eyes). Here, we will focus on some important depth cues that contribute to depth perception.

Binocular Cues:

Convergence:
Convergence is a binocular cue that refers to the inward turning of both eyes when focusing on an object that is close to us. The greater the convergence, the closer the object. This helps the brain to compute the depth or distance of objects based on the angle of convergence.

Retinal Disparity:
This occurs because each eye views the world from a slightly different angle, and these differences are used by the brain to compute distance. The brain compares the two images and calculates how far apart the objects are based on the disparity between the images in each retina.

Monocular Cues:

Linear Perspective:
Linear perspective is a monocular cue where parallel lines appear to converge as they recede into the distance. The closer the lines are to each other, the greater the perceived depth. For example, railroad tracks seem to meet at the horizon, creating the illusion of depth.

Relative Size:
When two objects are similar in size, the one that appears smaller is perceived as being further away. This cue is effective when the objects are of known size or when the size relation between them is recognized by the observer.

Texture Gradient:
The texture gradient is the gradual change in the pattern or texture of surfaces as they recede into the distance. This visual cue is used by the brain to judge depth based on the amount of detail visible in the texture. Objects that are farther away have finer, less detailed textures, while closer objects have more discernible details.

Interposition:
Interposition occurs when one object overlaps another, leading the brain to perceive the object that is in front as being closer. This is a common depth cue in everyday life.

Motion Parallax:
Motion parallax is a cue that occurs when an observer moves. Objects that are closer move faster across the visual field than objects that are further away. This difference in motion helps the brain gauge depth by using the speed of moving objects as a cue to their distance.