5.2 The human nervous system

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Question 23

Medium

Maya, a university student, has noticed that she can easily read the notes on her desk (at a close distance), but the writing on the lecture hall presentation screen (at a distance) appears blurry and out of focus. She is diagnosed with myopia (short-sightedness).

Explain the physiological changes that must occur in a healthy human eye to adjust its focus from reading a close-up textbook to viewing a distant lecture presentation screen.

[6]

Explain why Maya’s eye, affected by myopia, fails to form a clear image of the distant presentation screen.

[2]

The diagram below illustrates the path of light rays in an uncorrected and corrected myopic eye.

A diagram comparing an uncorrected myopic eye, where light from a distant object focuses in front of the retina, and a corrected myopic eye, where a concave lens diverges the light rays to focus them perfectly on the retina.

Describe how a concave lens corrects Maya's myopia, enabling her to see the distant screen clearly.

[3]

5.2 The human nervous system

Question 23

5.2 The human nervous system Questions

5.2 The human nervous system

Question 23

5.2 The human nervous system Questions