F FObject Objek

ImageImej

Convex lensKantacembung

F FObject Objek

ImageImej

Convex lensKantacembung

SULIT 1 4531

SECTION B (20 marks)

5. Diagram 5.1 and Diagram 5.2 are the ray diagram to show the formation of image of a pensil by a convex lens.Rajah 5.1 dan Rajah 5.2 merupakan rajah sinar bagi menunjukkan pembentukan imej bagi sebatang pensil oleh sebuah kanta cembung.

Diagram 5.1Rajah 5.1

Diagram 5.2Rajah 5.2

(a) What is meant by real image?Apakahmaksudimejnyata?

[1 mark]

SULIT 2 4531

(b) Observed Diagram 5.1 and Diagram 5.2.Perhatikan Rajah 5.1 dan Rajah 5.2.

(i) Compare the object distance, the image distance and the size of the image.Bandingkanjarakobjek, jarakimejdansaizimej.

[3 marks](ii) State the relationship between the object distance and the image distance.

Nyatakanhubunganantarajarakobjekdanjarakimej.[1 mark]

(iii) State the relationship between the object distance and the size of the image.Nyatakanhubunganantarajarakobjekdansaizimej.

[1 mark]

(c) Explain why a piece of paper burns when placed under a convex lens aimed towards hot sun rays.Huraikanmengapasehelaikertasterbakarapabiladiletakkan di bawahsebuahkantacembung yang dihalakankepadacahayamatahari yang terik.

[4marks]

(d) You are given two convex lenses, R and S, with focal lengths 40 cm and 5 cm respectively. Both the lenses are used to build a simple astronomical telescope at normal adjustment.

Andadibekalkanduakantacembung, P dan Q. Panjang focus kantamasing – masingialah 40 cm dan 5 cm. Kedua – duakantaitudigunakanuntukmembinasebuahteleskopastronomiringkaspadapelarasan normal.

(i) Using the two lenses, explain how you are going to build the simple astronomical telescope.Denganmenggunakanduakantatersebut, terangkanbagaimanaandaakanmembinasebuahteleskopastronomiringkastersebut.

[6 marks]

(ii) Suggest modifications that need to be done on the telescope to produce clearer and bigger images.Cadangkanpengubahsuaian yang perludilakukanterhadapteleskopituuntukmenghasilkanimej yang lebihjelasdanlebihbesar.

[4marks]

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SULIT 3 4531

SECTION C (20 marks)

6. Diagram below shows a strong spring that is used to make a cradle for babies. Table below shows the characteristics of different types of springs that can be used for making a cradle.Rajah di bawah menunjukkansatu spring yang kuat yang digunakanuntukmembuatbuaianbayi. Jadual di bawahmenunjukkanciri-ciri spring yang berlainanjenis yang bolehdigunakanuntukmembuatbuaianbayi.

Diagram /Rajah  

Table /Jadual 

(a) (i) What is the meaning of spring constant?Apakah yang dimaksudkandenganpemalar spring?

[1 mark/1 markah]

 

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SULIT 4 4531

(ii) You are assigned to investigate the characteristics of the springs in Table above to make a cradle for babies.Andaditugaskanuntukmengkajiciri-ciri spring dalamJadual di atas untukdigunakanbagimembuatbuaianbayisepertipada Rajah di atas.

Explain the suitability of each characterisitc shown in Table above. Then suggest the most suitable spring to be used and give your reasons.TerangkankesesuaiansetiapciridalamJadual di atas. Seterusnyatentukan spring yang paling sesuaidigunakanuntukmembuatbuaianbayiitudanberikansebabuntukpilihananda.

[10 marks/10 markah] 

(b) The original length of a spring is 20 cm. When a load of 10 N is hooked onto the spring, itslength becomes 25 cm. When a load of more than 50 N is hooked, the spring does not returnto its original length even after the load is removed.Satu spring mempunyaipanjangasal 20 cm. Apabilabeban 10 N diletakkan, panjang spring itumenjadi 25 cm. Apabilabebanlebihdaripada 50 N diletakkan, spring initidakkembalikepanjangasalapabilabebanitudialihkan.

(i) Sketch a graph of extension against stretching force for the spring. Use your graph to explain the process.Lakarkangrafpemanjanganmelawandayareganganbagi spring itu. Gunakangrafandauntukmenerangkan proses itu.

[4 marks/4 markah] 

(ii) Calculate the amount of work done by the spring when a load of 25 N is hooked onto it.Hitungkankerja yang dilakukanoleh spring apabilabeban 25 N diletakkan.

[2 marks/2 markah] 

(iii) Which type of arrangement of springs will cause the springs to be stronger, the parallel arrangement or the series arrangement? Explain this observation.Susunan spring yang manakahakanmenjadilebihkuat, susunansecaraselariatausesiri?Jelaskanpemerhatianini.

[3 marks/3 markah]

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