5.2 The human nervous system

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Question 30
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The human eye can focus on objects at different distances.

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

A cross-section diagram of a human eye focusing on a distant object. Parallel light rays pass through the cornea and a thin 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 near object.

[6]
b.

Explain why a long-sighted person has difficulty seeing near objects clearly.

[2]
c.

Long-sightedness can be corrected by wearing spectacles. Describe how spectacle lenses can correct long-sightedness.

[3]

5.2 The human nervous system Questions

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