Chapter 11 Ray Diagrams (光線圖)

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Presentation transcript:

Chapter 11 Ray Diagrams (光線圖) convex lens 2019/5/9

…is refracted through F. Rule 1 A ray parallel to the principal axis (主軸) ... F C …is refracted through F. 2019/5/9

…is refracted parallel to the principal axis. Rule 2 A ray passing through F'... F' F C …is refracted parallel to the principal axis. 2019/5/9

Rule 3 A ray passing through C... F F' C …travels straight on. 2019/5/9

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 2019/5/9

C F' 2F F 5 cm I O 2019/5/9

Nature of image 2F O F I C 2F' F' object: beyond 2F ’ image: real (實像), inverted (倒立) and diminished (縮小) 2019/5/9

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) 2019/5/9

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) 2019/5/9

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) 2019/5/9

Images formed by a convex lens Simulation Simulation 2019/5/9

real 實像 magnified 放大

virtual 虛像 magnified 放大

Homework: Assignment Book 1. Chapters 11 Q.1-4 (p.21-24) 2. Deadline: 2010-12- _____ 30