1. Chapter 11 Ray Diagrams (光線圖)
convex lens
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2. …is refracted through F.
Rule 1
A ray parallel to the principal axis (主軸) ... F C
…is refracted through F.
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3. …is refracted parallel to the principal axis.
Rule 2
A ray passing through F'... F' F C
…is refracted parallel to the principal axis.
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4. Rule 3 A ray passing through C... F F' C …travels straight on.
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5. Example
An object of height 5 cm is placed at 15 cm from a convex lens of focal length 10 cm. Find the position of the image. C F' 2F F O
5 cm
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6. C F' 2F F
5 cm I O
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7. Nature of image 2F O F I C 2F' F' object: beyond 2F ’ image:
real (實像), inverted (倒立)
and diminished (縮小)
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8. real (實像), inverted (倒立) and same size (大小一樣)2F F O I C
2F' F'
object:
at 2F ’
image:
real (實像), inverted (倒立) and same size (大小一樣)
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9. real (實像), inverted (倒立) and magnified (放大)O C
2F' F'
object:
between F ’ and 2F ’
image:
real (實像), inverted (倒立) and magnified (放大)
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10. virtual (虛像), erect (正立) and magnified (放大)O F C
2F' F'
object:
between F’ and C
image:
virtual (虛像), erect (正立) and magnified (放大)
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11. Images formed by a convex lens
Simulation
Simulation
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15. real 實像
magnified 放大

19. virtual 虛像
magnified 放大

30. Homework: Assignment Book 1. Chapters 11 Q.1-4 (p.21-24)
2. Deadline: _____ 30