SCI 10_ LEC 3-89737682638678 - Copy.pptx

CHARACTERISTICS OF IMAGES

1. CHARACTERISTICS OF IMAGES Exploring how images form in plane, concave, and convex mirrors.

2. MIRROR, MIRROR What can you see when you look at the mirror, or a polished metal or a still pool of water?

3. REFLECTION OF LIGHT Bouncing back of light rays when they encounter a surface or barrier causing them to change direction and return to the original medium.

4. ANGLE OF INCIDENCE ANGLE OF REFLECTION i r NORMAL PLANE MIRROR INCIDENT RAY REFLECTED RAY i = r LAW OF REFLECTION The incident ray, reflected ray, and the normal line all lie in the same plane. The angle of incidence is equal to the angle of reflection.

5. THE RAY MODEL OF LIGHT

6. If the bundle of light rays is incident upon a smooth surface, then the light rays reflect and remain concentrated in a bundle upon leaving the surface. On the other hand, if the surface is microscopically rough, the light rays will reflect and diffuse in many different directions.

7. REFLECTION IN PLANE MIRROR Image is virtual; Same size as the object; Same orientation as the object; Same distance from the mirror as the object; and Left-right reversal.

8. If you view an image of yourself in a plane mirror (perhaps a bathroom mirror), you will quickly notice that there is an apparent left-right reversal of the image. That is, if you raise your left hand, you will notice that the image raises what would seem to be its right hand. If you raise your right hand, the image raises what would seem to be its left hand. This is often termed left-right reversal.

9. REFLECTION ON SPHERICAL MIRRORS

10. REFLECTION ON SPHERICAL MIRRORS

11. When light rays from an object hit the surface of a plane mirror, they reflect off the mirror at the same angle at which they arrive but in a different direction. MIRRORS AND REFLECTION Mirrors work on the principle of reflection , where light bounces off surfaces.

12. When light rays from an object hit the surface of a plane mirror, they reflect off the mirror at the same angle at which they arrive but in a different direction. MIRRORS AND REFLECTION Mirrors work on the principle of reflection , where light bounces off surfaces.

13. Reflection occurs when light bounces off a surface Absorption happens when materials take in light, often converting to heat. Transmission is when light passes through a transparent material, like glass or water THE RAY MODEL OF LIGHT When light rays encounter an object, they can be reflected, absorbed or transmitted.

14. The diagram shows a light ray hitting a plane mirror. What would be the angles of incidence and reflection? LEARNING CHECK 30° i = 30°, r = 30° i = 60°, r = 30° i = 30°, r = 60° i = 60°, r = 60° A B C D

15. The correct answer is D . The angle of incidence and angle of reflection is 60°. LEARNING CHECK ANSWER KEY i = 90° - 30° = 60° 30° Since i = r , then the angle of reflection (r) is also 60°. D 60° 60°