15 exam-style questions. Write your answer, check it against the mark scheme and tick the points you earned. Your marks stay on this device. Your writing is not saved.
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3.42 Focusing and responding to light
Exam question
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Describe how the eye focuses on a near object.
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Total for this question: 3 marks
3.42 Focusing and responding to light
Exam question
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Describe how the eye focuses on a distant object.
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Total for this question: 3 marks
3.42 Focusing and responding to light
Exam question
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Describe how the pupil becomes smaller in bright light.
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Total for this question: 3 marks
3.42 Focusing and responding to light
Exam question
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Explain why the pupil reflex protects the eye.
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Total for this question: 2 marks
3.42 Focusing and responding to light
Exam question
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What happens to the radial muscles of the iris in dim light?
(1)Total for this question: 1 mark
3.42 Focusing and responding to light
Exam question
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Illustrative data.
| Light intensity / lux | Pupil diameter / mm |
|---|---|
| 10 | 7.0 |
| 100 | 5.5 |
| 500 | 4.0 |
| 1000 | 3.0 |
| 2000 | 2.5 |
Describe how the pupil diameter changed as the light became brighter.
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Total for this question: 2 marks
3.42 Focusing and responding to light
Exam question
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| Light intensity / lux | Pupil diameter / mm |
|---|---|
| 10 | 7.0 |
| 100 | 5.5 |
| 500 | 4.0 |
| 1000 | 3.0 |
| 2000 | 2.5 |
Calculate the percentage decrease in pupil diameter from 10 lux to 2000 lux.
(2)Total for this question: 2 marks
3.42 Focusing and responding to light
Exam question
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Explain why it is hard to read in dim light immediately after coming in from bright sunlight.
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Total for this question: 2 marks
3.42 Focusing and responding to light
Exam question
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Explain why older people often need reading glasses.
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Total for this question: 2 marks
3.42 Focusing and responding to light
Exam question
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Explain why doctors shine a light into the eyes of an unconscious patient.
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Total for this question: 2 marks
3.42 Focusing and responding to light
Exam question
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When looking at a near object, the lens is:
(1)Total for this question: 1 mark
3.42 Focusing and responding to light
Exam question
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Suggest why the pupil reflex is described as antagonistic muscle action.
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Total for this question: 2 marks
3.42 Focusing and responding to light
Exam question
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Compare the state of the ciliary muscles and suspensory ligaments when viewing a near and a distant object.
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Total for this question: 2 marks
3.42 Focusing and responding to light
Exam question
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Explain why eye drops that relax the circular muscles are used before an eye examination.
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Total for this question: 2 marks
3.42 Focusing and responding to light
Exam question
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Suggest why both pupils constrict when a light is shone into only one eye.
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Total for this question: 2 marks
