Bab 5 Tingkatan 4Cahaya Kertas 3Chapter 5 Form 4 Light Paper 3

SKEMA JAWAPAN KERTAS 3 BAHAGIAN B

QuestionMarking SchemeSub Mark

1(a)Inference : The image distance depends on the object distance Jarak imej bergantung kepada jarak objek1

(b)Hypothesis : When the object distance decreases, the image distance increases. Apabila jarak objek berkurang, jarak imej bertambah.1

(c) (i)Aim : To investigate the relationship between the object distance and the image distance, Menyiasat hubungan diantara jarak objek dan jarak imej.1

(ii)Variables:MV : object distance, // Jarak objek , uRV : Image distance // jarak imej , vCV : focal length, Panjang fokus2

(iii)Apparatus and materialsConvex lens, bulb, power supply, white screen, cardboard plasticine and metre rule.Kanta cembung, mentol, bekalan kuasa, skrin putih, kadbod , plastisin dan pembaris.1

(iv)

Arrangement of apparatus:

1

(v)Method of control the Manipulate variable: A convex lens with focal length, f = 10 cm is set up as shown in the diagram.Sebuah kanta cembung dengan panjang focus, f = 10 cm disediakan seperti dalam rajah. The distance between the cross wire and the convex lens, u = 30 cm is measured using metre rule.Jarak diantara dawai dan kanta cembung , u = 3- cm diukur menggunakan pembaris.Method of measuring the responding variable: The power supply is switched on. The white screen is moved back and forth until a sharp image is formed on the screen. The distance between the screen and lens, v is measured Bekalan kuasa dihidupkan . skrin putih digerakan ke belakang sehingga imej yang tajam terbentuk diatas skrin.Jarak diantara skrin dan kanta , v diukur

Repeated the experiment at least 4 times The experiment is repeated with u = 26.0 cm, 22.0 cm, 18.0 cm and 14.0 cm.Eksperimen diulang dengan u = 26.0 cm, 22.0 cm, 18.0 cm dan 14.0 cm.

1

1

1

(vi)Tabulation of data

Object distance, u / cmJarak objek , u / cmImage distance, v / cmJarak imej,v / cm

30.0

26.0

22.0

18.0

14.0

1

(vii)Analysing data

Image distance / jarak imej

Object distance /Jarak objek

1

Total 12

QuestionMarking SchemeSub Mark

1(a)Inference : The thickness of the lens affects focal length.Ketebalan kanta mempengaruhi panjang focus. 1

(b)Hypothesis : When the thickness of the lens increase , focal length decrease.Apabila ketebalan kanta bertambah, panjang focus berkurang.1

(c)(i)Aim : To investigate the relationship between the thickness of the lens and focal length.Menyiasat hubungan diantara ketebalan kanta dan panjang focus.1

(ii)Variables:MV : Thickness of lens // ketebalan kanta.RV : Focal length // Panjang focus.CV : focal length, Panjang focus, f( Note : Constant variable can be ignored. )11

(iii)Apparatus and materialsConvex lens, screen, metre rule, lens holder.Kanta cembung, skrin, pembaris, pemegang kanta.1

(iv)

Arrangement of apparatus:

1

(v)

State the method to control the manipulated variable.1. A convex lens with the thickness 0.4 cm is placed in front of a screen.Kanta cembung dengan ketebalan kanta 0.4 cm diletakkan dihadapan skirn.

State the method to measure the responding variable.2. The screen is adjusted until a sharp image is obtained and the distance between the lens and the screen is measured.Skrin dilaraskan sehingga imej yang tajam diperolehi dan jarak antara kanta dan skrin diukur.

Repeat the experiment at least four times.3. Experiment was repeated using convex lenses of thickness 0.6 cm, 0.8 cm, 1.0 cm and 1.2 cm.Eksperimen diulang menggunakan kanta cembung dengan ketebalan kanta 0.6 cm, 0.8 cm, 1.0 cm dan 1.2 cm.

1

1

1

(vi)State how the data is tabulated.

Thickness / cmKetebalan / cmFocal length / cmPanjang fokus, cm

0.4

0.6

0.8

1.0

1.2

1

(vii)State how the data is analysed

Focal length/ panjang fokus

Thickness / ketebalan

1

Total 12

QuestionMarking SchemeSub Mark

1(a)Inference : The size of the image depends on the object distance Size imej bergantung kepada jarak objek 1

(b)Hypothesis : When the object distance increases, the image size decreases.Apabila jarak objek bertambah, saiz imej berkurang.1

(c)(i)Aim : To study the relationship between the object distance and the height of the image Mengkaji hubungan diantara jarak objek dan ketinggian imej.1

(ii)Variables:MV : Object distance // Jarak objek.RV : Height of image // ketinggian imej.CV : Power of lens // kuasa kanta

1

1

(iii)Apparatus and materialsConvex lens, meter rule, screen, lens holder, object Kanta cembung, skrin, pembaris, pemegang kanta.objek.1

(iv)

Arrangement of apparatus:

1

(v)

State the method to control the manipulated variable.1. The object distance is measured to be u = 20 cm.Ukur jarak objek , u = 20 cm.

State the method to measure the responding variable.2. The height of the image that formed on the screen is measured using the ruler.Ketinggian imej yang terbentuk diskrin diukur menggunakan pembaris.

Repeat the experiment at least four times.3. The experiment is repeated by using different values of u = 25 cm, 30 cm, 35 cm, 40 cm dan 45 cm.Eksperimen ini diulangi dengan menggunakan nilai-nilai yang berbeza u = 25 cm, 30 cm, 35 cm, 40 cm dan 45 cm.

1

1

1

(vi)State how the data is tabulated.

Object distance / cmJarak objek / cmHeight of image / cmKetinggian imej / cm

0.4

0.6

0.8

1.0

1.2

1

(vii)State how the data is analysed

Height of image / ketinggian imej

Object distance / Jarak objek

1

Total 12

1