Reflection Objectives 1 Describe how light reflects off

Reflection Objectives: 1. Describe how light reflects off rough and smooth surfaces. 2. Explain the law of reflection.

Reflection of Light • Light can be modeled as a _______ or as a stream of ______. • A 3 rd model of light is a light ray. – Light rays are lines drawn to trace the path of light. – The drawing of light rays is called a ray diagram. – Ray diagrams are especially useful in reflection and refraction of light. • What types of objects reflect light?

Reflection of Light, cont. • Law of Reflection – “The angle of incidence equals the angle of reflection. ” – Normal: a line perpendicular to the surface where light hits it

Reflection of Light, cont. • Why can you see your reflection in a store window, but not in a brick wall? What differences are there in these two surfaces? • Diffuse reflection – Reflection off rough surfaces (i. e. , the wall) – Incoming parallel light waves are reflected in many directions.

Reflection of Light, cont. • Regular reflection – Reflection off smooth surfaces – Reflects parallel light waves in only one direction

Review • What types of objects reflect light? • If you cannot see your reflection in an object, what type of reflection is occurring? • When you see your reflection, what type of surface are you looking into? • State the law of reflection.

Assignment!! Directions to write on the back side of your worksheet: 1. Draw the 2 surfaces drawn on the board. 2. Draw a ray diagram for light rays reflecting off the 2 surfaces.