DO NOW QUESTION What do you think when you hear the word “optics”?

Students will be able to create a light ray diagram. Objective Students will be able to create a light ray diagram.

Unit 8: Light and Optics Chapter 22: Optics 22.1 Optics and Reflection 22.2 Refraction 22.3 Mirrors, Lenses, and Images

Optics Optics is the study of how light behaves. (1) Explaining how magnification occurs is part of the science of optics. Light rays is an imaginary line representing a light beam’s path. An arrow shows the direction. (2)

Optics A ray diagram is an accurately-drawn sketch showing how light rays interact with mirrors, lenses, and other optical devices. (3) The curved surface of a magnifying glass bends light so that it appears to come from a much larger thumb. (4)

Reflection and Refraction (5-7) A lens is an optical device that is used to bend light in a specific way. A converging lens bends light so that the light rays come together to a point. A diverging lens bends light so it spreads light apart instead of coming together.

Reflection and Refraction Mirrors reflect light and allow us to see ourselves. (8) A prism is another optical device that can cause light to change directions. (8) A prism is a solid piece of glass with flat polished surfaces. EX: Telescopes, cameras, and supermarket laser scanners

Light rays (10) Reflection occurs when light bounces off a surface and when light bends while crossing through materials.

Reflection (11) In specular reflection each incident ray bounces off in a single direction. A surface that is not shiny creates diffuse reflection. In diffuse reflection, a single ray of light scatters into many directions.

Reflection (12) Images appear in mirrors because of how light is reflected by mirrors. A normal line (in the field of optics) is a line that is perpendicular to a surface.

Reflection (13) The incident ray follows the light falling onto the reflective surface, such as a mirror. The reflected ray follows the light bouncing off the mirror.

The law of reflection (15) The law of reflection states that the angle of incidence equals the angle of reflection. Light rays reflect from a mirror at the same angle at which they arrive.

Law of Reflection The incident ray strikes the mirror. The reflected ray bounces off. The angle of incidence equals the angle of reflection.

22.1 Investigation: Reflection Key Question: How do we describe the reflection and refraction of light?