5.2 The human nervous system

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Question 26
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The human eye can focus on objects at different distances.

The figure below shows how a clear image of a near object is formed on the retina.

A cross-section diagram of a human eye focusing on a near object. Light rays diverge from a point on a near object on the left, pass through the cornea and a relatively thick, rounded lens inside the eye, and converge to meet at a single point exactly on the retina at the back of the eye.

a.

Explain how the person's eye adjusts to form a clear image of a distant object.

[6]
b.

Explain why a short-sighted person has difficulty seeing distant objects clearly.

[2]
c.

Short-sightedness can be corrected by wearing spectacles. Describe how spectacle lenses can correct short-sightedness.

[3]

5.2 The human nervous system Questions

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