9.1 Write down TWO differences between a concave lens and a convex lens - NSC Technical Sciences - Question 9 - 2021 - Paper 2
Question 9
9.1 Write down TWO differences between a concave lens and a convex lens.
9.2 Some people's eyes are unable to focus on nearby objects, as indicated in the diagram b... show full transcript
Worked Solution & Example Answer:9.1 Write down TWO differences between a concave lens and a convex lens - NSC Technical Sciences - Question 9 - 2021 - Paper 2
Step 1
Write down TWO differences between a concave lens and a convex lens.
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Answer
A convex lens is thicker in the middle than at the edges, while a concave lens is thinner in the middle than at the edges.
A convex lens bulges outward in the center, whereas a concave lens curves inward.
Step 2
Write down the NAME of the eye condition as shown in the diagram above.
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Answer
Far-sightedness/hyperopia (hypermetropia).
Step 3
Which type of lens can be used to correct the condition named in QUESTION 9.2.1?
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Answer
Convex lens.
Step 4
Redraw the diagram in your ANSWER BOOK. Indicate ALL the rays and the CORRECT type of lens.
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Answer
In the diagram, include the following:
Ray 1 starts at the head of the object and moves parallel to the principal axis.
Ray 2 starts at the head of the object and passes through the optical center without changing direction.
Ray 3 deflects from Ray 1 on the other side of the lens and passes through F.
Also label the object, focal points, and the image with the principal axis of the diagram clearly indicated.
