Ch.13 Applications (應用) of Convex Lenses

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Presentation transcript:

Ch.13 Applications (應用) of Convex Lenses magnifying glass (放大鏡) camera (照相機) spectacles (眼鏡) telescope (望遠鏡) …… 2018/6/25

Magnifying Glass (放大鏡) object image F’ F convex lens 2018/6/25

Class Exercise 13.1 A convex lens is used as a magnifying glass. The focal length of the lens is 5 cm. An object 2 cm high is placed 3 cm from the lens. (a) Draw a ray diagram to find the position and size of the image. (b) Magnification = ? 2018/6/25

Class Exercise 13.1 (a) (b) m = 7.5 cm / 3 cm = 2.5 2018/6/25

What is the magnification of the image? Class Exercise 13.2 What is the magnification of the image? If the distance between the single line paper and the lens is 5 cm, what is the distance of the image from the lens? 2018/6/25

What is the magnification of the image? m = 2 Class Exercise 13.2 What is the magnification of the image? m = 2 If the distance between the single line paper and the lens is 5 cm, what is the distance of the image from the lens? image distance = 5 cm x 2 = 10 cm 2018/6/25

Class Exercise 13.2 (c) focal length = ? 2018/6/25

Class Exercise 13.2 (c) focal length = 10 cm 2018/6/25

1. Chapter 13 Applications of Convex lenses Q. 1 (p.26) Homework: Assignment Book 1. Chapter 13 Applications of Convex lenses Q. 1 (p.26) 2. Deadline: 2010-2-___ 10

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