7.
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Rajah 7.1 menunjukkan satu imej yang dilihat menerusi sebuah kanta cembung yang mempunyai panjang fokus \(10\text{ cm}\).
Diagram 7.1 shows an image seen through a convex lens that has a focal length of \(10\text{ cm}\).
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Rajah 7.1
Diagram 7.1
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(a)
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Apakah maksud panjang focus?
What does focal length mean?
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[1 markah]
[1 mark] |
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(b)
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(i)
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Lukis satu rajah sinar pada rajah di bawah untuk menunjukkan bagaimana imej bagi objek itu terbentuk.
Draw a ray diagram in the figure below to show how the image of the object is formed.
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[2 markah]
[2 marks] |
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(ii)
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Nyatakan ciri-ciri imej yang terbentuk.
State the characteristics of the image formed
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[1 markah]
[1 mark] |
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(c)
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Rajah 7.2 menunjukkan binocular berprisma. Kedudukan bagi dua prisma dan dua kanta pada satu sisi binocular adalah seperti yang ditunjukkan.
Diagram 7.2 shows prism binoculars. The position of two prisms on one side of the binoculars are as shown.
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Rajah 7.2
Diagram 7.2
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Kanta objek digunakan dalam binocular itu supaya objek boleh dilihat dengan jelas. Jadual di bawah menunjukkan ciri-ciri tiga kanta.
Objective lens is used in the binoculars so that the object can be seen clearer. Table below shows the characteristics of three lenses.
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Kanta
Lens
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Panjang Fokus
Focal length
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Diameter kanta
Diameter of the lens
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\(P\) |
\(1.0\text{ cm}\) |
Kecil / Small |
\(Q\) |
\(10.0\text{ cm}\) |
Besar / Big |
\(R\) |
\(100.0\text{ cm}\) |
Besar / Big |
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Berdasarkan jadual tersebut, nyatakan ciri-ciri kesesuaian kanta untuk digunakan sebagai kanta objek. Beri satu sebab untuk kesesuaian ciri itu.
Based on the table, state the suitable characteristics of the lens to be used as the objective lens. Give one reason for the suitable characteristic.
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(i)
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Panjang fokus
Focal length
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Sebab
Reason
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[2 markah]
[2 marks] |
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(ii)
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Diameter kanta
Diameter of the lens
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Sebab
Reason
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[2 markah]
[2 marks] |
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(d)
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Berdasarkan jawapan di 7(c)(i) dan 7(c)(ii), tentukan kanta yang paling sesuai digunakan sebagai kanta objek.
Based on the answers in 7(c)(i) and 7(c)(ii), determine the most suitable lens to be used as the objective lens.
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[1 markah]
[1 mark] |