1. Ch.13 Applications (應用) of Convex Lenses
magnifying glass (放大鏡)
camera (照相機)
spectacles (眼鏡)
telescope (望遠鏡) ……
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2. Magnifying Glass (放大鏡)
object
image F’ F
convex lens
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3. 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 = ?
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4. Class Exercise 13.1
(a)
(b) m = 7.5 cm / 3 cm = 2.5
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5. 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?
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6. 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
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7. Class Exercise 13.2
(c) focal length = ?
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8. Class Exercise 13.2
(c)
focal length = 10 cm
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10. 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: ___ 10