The diagram below represents a type of visual defect - NSC Life Sciences - Question 3 - 2021 - Paper 1
Question 3
The diagram below represents a type of visual defect.
3.1.1 Identify part F.
3.1.2 State ONE function of part B.
3.1.3 Explain why the light rays must focus on pa... show full transcript
Worked Solution & Example Answer:The diagram below represents a type of visual defect - NSC Life Sciences - Question 3 - 2021 - Paper 1
Step 1
Identify part F.
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Answer
Part F is the sclera.
Step 2
State ONE function of part B.
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Answer
Part B supplies cells of the eye with oxygen and nutrients.
Step 3
Explain why the light rays must focus on part D rather than on part E.
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Answer
Light rays should focus on part D (the retina) as it contains the necessary photoreceptors (rods and cones) for clear vision. If they focus on part E, the image would be blurred due to a lack of photoreceptors.
Step 4
Name the type of lens that is used to correct the visual defect shown in the diagram.
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Answer
The type of lens used to correct this visual defect is a concave lens.
Step 5
Describe how the type of lens named in QUESTION 3.1.4 corrects the visual defect.
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Concave lenses help to diverge the light rays before they enter the eye, ensuring they hit the retina correctly to form a clear image.
Step 6
Explain ONE way in which part C is structurally suited for accommodation.
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Part C is elastic, allowing it to change shape easily to adjust focus for different distances.
Step 7
Name the TWO muscles found in part G.
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The muscles found in part G are the circular (sphincter) muscles and the radial muscles.
Step 8
Name and describe the visual defect that occurs when part A is uneven.
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Answer
The visual defect that occurs is astigmatism, characterized by distorted or blurred vision due to an uneven curvature of the cornea or lens.
