JPN Pahang Physics Module Form 4Chapter 5 Light
Transcript of JPN Pahang Physics Module Form 4Chapter 5 Light
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JPN Pahang Physics Module Form 4Chapter 5 Light20Refraction of rays parallel to the principal axis of a convex lens
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:Draw in the following diagrams the paths of the rays after passing through the lens.Write in the boxed provided, the name of the
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point or line shown.i)ii)iii)iv)
Focal planeSecondary focusPrincipal focusPrincipal focusFocal
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planeSecondary focusFFFF
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JPN Pahang Physics Module Form 4Chapter 5 Light
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21Principles of constructing ray diagrams: Complete the path of each ray after passing through thelensi)
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ii) iii)iv) v) vi)vii) viii)Exercise 1:State the meaning of each of the following terms:i) Focal length ,
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f :The distance between optic centre and the principal focus ii) Object distance,
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u:The distance between the object and optic centreiii) Image distance,v
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:The distance between the image and the optic centre Exercise 2:Describe how you would
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estimate the focal length of a convex lens in the school lab.Place the lens facing the window on the far side of the lab. Adjust the distance of a
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screen behind the lens until a sharp image of the window is formed. Measure the focal length (distance betweenthe lens and the image).
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JPN Pahang Physics Module Form 4Chapter 5 Light22Characteristics of image formed by a convex lens: (Construction of ray diagram
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method)Construct ray diagrams for each of the following cases and state the characteristics of the imageformed.i)
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Case 1:u > 2 f where u
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= object distance ; and f = focal length of lens.Characteristics of image: Diminished, real and inverted ii)
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Case 2:u= 2 f Characteristics of image:
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Same size, real and inverted iii) Case 3:2 f
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>u> f Characteristics of image: Magnified, real and inverted
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FF2FobjectLensFF2FobjectLensFF2FobjectLensimageimageimage
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