PPT-Reflection and Refraction

Unit 8 How we use light to see To the physicist the colors of things are not in the substances of the things themselves Color is in the eye of the beholder and is provoked by the frequencies of light emitted or reflected by things. brPage 2br pp. 503 – 506, and 525 (24.1). Mr. Richter. Agenda. Warm-Up. Notes:. The Speed of Light. Index of Refraction. Angle of Refraction. Total Internal Reflection. Dispersion . Objectives: We Will Be Able To…. Reflection and Refraction. of . Light. Reflection and Refraction. Laws of reflection . Laws of refraction. Total internal reflection. The rainbow. 3. The Sun is about 1.5 × 10. 11. m away. The time for light to travel this distance is about:. Mr. . . Dvorsky. SNC2D1. Review of last chapter. From the last chapter, we know how light behaves when it travels in space or in the air – i.e. it travels in a straight line.. When light strikes a plane mirror, the angle of incidence = the angle of reflection. . What is Refraction?. In a vacuum (air) light travels in straight lines.. But what happens when light travels from one material into another?. Like for example, from air to water?. What Happens When Light hits a Medium. CMSC 435/634. General Approach. Ray Tracing. Shoot more rays. Rasterization. Render more images. 3. Shadows. Are p or q in shadow?. Can they “see” the light?. Ray Traced Shadows. Rays from . p. /. Presented by: Vandana Bathla & Eric Williams. Light Refraction. Have you ever wondered why it appears we see puddles of water on a highway on a hot summer day?. What you are seeing is not really water, but a mirage.. Refraction occurs at a boundary. The speed of light must change at the boundary. The angle of the light ray is measured from the normal, as was the case with reflection. If the speed slows across the boundary, the refracted angle will be smaller – the light ray will bend toward the normal.. Define refractive index.. Demonstrate refraction.. State the Laws of Refraction.. Solve problems about refraction.. HL: Solve problems about refractive index in terms of relative speeds.. Give examples of refraction in nature.. Reflection. When a wave reaches a boundary between two media, usually some or all of the wave bounces back into the first medium.. A metal surface is rigid to light waves that shine upon it. . Light . Define refractive index.. Demonstrate refraction.. State the Laws of Refraction.. Solve problems about refraction.. HL: Solve problems about refractive index in terms of relative speeds.. Give examples of refraction in nature.. LIGHT. Light carries . energy. and . power.. Light . is a form of . energy. that travels.. The . intensity. . of light is the amount of energy per . second. falling on a surface.. Most light sources distribute their light . Of light. By: Ahmed. Definitions. Luminous . objects . – . generate their own light (the sun). Illuminated. objects – reflect light (the moon). Definitions. Line . of Sight . – a line from an object or image to your eyes (light from the object travels along this line to your eyes). The Law of Reflection. Reflection. Light behaves in a very predictable manner. Light can only travel in a straight line (most of the time…). The . Law of Reflection. states that the INCIDENT (incoming) light’s angle will be exactly the same as the reflecting light’s angle.