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The image displays text and diagrams related to optics and the human eye. There is no information about the city of Jalingo, Nigeria.

The textual content discusses the processes involved in producing clear vision, namely refraction of light rays and accommodation of the eyes. It explains how light rays bend when passing from one medium to another, as illustrated in a diagram of a straw in a glass of water (Figure 13:17, A).

A separate diagram (Figure 13:17, B) shows parallel light rays passing through a biconvex lens, demonstrating their convergence.

Another section details the accommodation of the eyes to light, mentioning three factors: pupils, movement of eyeballs (convergence), and the lens. It explains how pupil size is regulated by the iris and how it affects light entry.

A detailed diagram (Figure 13:18) illustrates the structure of the eye and how the lens changes shape for distant and near vision, showing the roles of the cornea, iris, ciliary body, and suspensory ligament.
FM-KpyEx1

Jun 30, 2026, 3:56 PM

Jalingo, Nigeria

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The image displays text and diagrams related to optics and the human eye. There is no information about the city of Jalingo, Nigeria. The textual content discusses the processes involved in producing clear vision, namely refraction of light rays and accommodation of the eyes. It explains how light rays bend when passing from one medium to another, as illustrated in a diagram of a straw in a glass of water (Figure 13:17, A). A separate diagram (Figure 13:17, B) shows parallel light rays passing through a biconvex lens, demonstrating their convergence. Another section details the accommodation of the eyes to light, mentioning three factors: pupils, movement of eyeballs (convergence), and the lens. It explains how pupil size is regulated by the iris and how it affects light entry. A detailed diagram (Figure 13:18) illustrates the structure of the eye and how the lens changes shape for distant and near vision, showing the roles of the cornea, iris, ciliary body, and suspensory ligament.

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FM-KpyEx1

Jun 30, 2026, 3:56 PM

Jalingo, Nigeria

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