Ch 9 Lens 1 Convex Lens and Concave

Ch. 9 Lens (透鏡) 1

Convex Lens (凸透鏡) and Concave Lens (凹透鏡) (a) A lens is made from _________ materials usually made of glass. Their surfaces are ________. (b) There are two types of lenses: _______ lenses (凸透鏡) and ______ lenses (凹透鏡). (c) Convex lenses are thicker in the middle than at the edge. Concave lenses are thinner in the middle. (d) When light rays pass through lens, ________ occurs. 2

Convex Lens (凸透鏡) and Concave Lens (凹透鏡) transparent (透明) materials usually (a) A lens is made from _________ curved (彎曲) made of glass. Their surfaces are ________. (b) There are two types of lenses: _______ lenses (凸透鏡) and ______ lenses (凹透鏡). (c) Convex lenses are thicker in the middle than at the edge. Concave lenses are thinner in the middle. (d) When light rays pass through lens, ________ occurs. 3

Convex Lens (凸透鏡) and Concave Lens (凹透鏡) transparent (透明) materials usually (a) A lens is made from _________ curved (彎曲) made of glass. Their surfaces are ________. (b) There are two types of lenses: convex _______ lenses (凸透鏡) concave lenses (凹透鏡). and ______ (c) Convex lenses are thicker in the middle than at the edge. Concave lenses are thinner in the middle. refraction (折射) (d) When light rays pass through lens, ________ occurs. 4

convex lenses concave lenses 5

Optical Centre (光心) and Principal Axis (主軸) 6

Optical Centre (光心) and Principal Axis (主軸) 7

Experiment (實驗) 9. 1 8

9

10

Convex lens F focus (焦點) 11

Experiment (實驗) 9. 2 12

13

14

Concave lens F focus (焦點) 15

Focus (焦點) and Focal Length (焦距) F C focal length 16

thinner lens => f is longer thicker lens => f is shorter 17

Class Exercise 9. 1 1 cm focal length = ? 18

Class Exercise 9. 1 1 cm focal length = 3 cm (2. 8 – 3. 2) 19

Homework: Assignment Book 1. Chapters 8, 9 (p. 15 -19) 2. Deadline: 2010 -11 -29 20