Depth perception allows us to see the world in three dimensions. Visual cues are used to achieve this. These cues are categorized into two main types: monocular cues (using one eye) and binocular cues (using two eyes).
Monocular cues are visual signals that allow us to perceive depth and distance with just one eye. Common monocular cues include:
Convergence is the simultaneous inward movement of both eyes toward each other, usually to focus on a nearby object. This inward turning of the eyes provides a cue about the distance of the object.
Since convergence requires the coordinated action of both eyes to work, it is classified as a binocular cue, not a monocular cue.
The question asks to identify the cue that is NOT a monocular cue. Based on the definitions:
Therefore, convergence is the correct answer as it is not a monocular cue.
| List-I | List-II |
| Electronic Configuration | First Ionisation energy (kJ mol$^{-1}$) |
| (A). ns$^2$ | (I). 2100 |
| (B). ns$^2$np$^1$ | (II). 1400 |
| (C). ns$^2$np$^3$ | (III). 800 |
| (D). ns$^2$np$^6$ | (IV). 900 |
| List-I | List-II |
| Spectroscopy | Property |
| (A). Raman | (I). Polarizability |
| (B). FTIR | (II). Dipole Moment |
| (C). UV-Visible | (III). Absorbance |
| (D). NMR | (IV). Spin |