logging in or signing up Reflection & Refraction chrisgj6 Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: Embed: Flash iPad Dynamic Copy Does not support media & animations Automatically changes to Flash or non-Flash embed WordPress Embed Customize Embed URL: Copy Thumbnail: Copy The presentation is successfully added In Your Favorites. Views: 1213 Category: Education License: All Rights Reserved Like it (2) Dislike it (0) Added: April 07, 2011 This Presentation is Public Favorites: 1 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript Slide 1: The King David High School Science Department Reflection and Refraction By Mr JonesReflection: Reflection For light reflecting off a plane mirror (flat, smooth, shiny): Mirror Incident Ray Reflected Ray Normal Angle of reflection (r) r i The normal is a line drawn at right angles (perpendicular) to the surface. Angle of incidence ( i ) =Reflection: Reflection For light reflecting off a plane mirror (flat, smooth, shiny): Mirror Angle of reflection (r) Angle of incidence ( i ) =Refraction: Refraction Air Perspex Incident Ray Emergent Ray Normal Normal Refracted RayRefraction: Refraction As light passes from a less optically dense material into a more optically dense material it moves towards the normal. As light passes from a more optically dense material into a less optically dense material it moves away from the normal. Less optically dense More optically dense Incident Ray Normal Less optically dense More optically dense Emergent Ray NormalTotal Internal Reflection: Total Internal Reflection Incident Ray Refracted Ray Reflected Ray When the angle of incidence is small (less than 42°) most of the light emerges from the Perspex and is refracted away from the normal. A tiny amount of light is reflected at the interface. i <42°Total Internal Reflection: Total Internal Reflection Incident Ray When the angle of incidence is 42° most of the light is refracted at 90° from the normal (along the interface). Some light is reflected at the interface. 42° is described as the critical angle. 42° 90°Total Internal Reflection: Total Internal Reflection Incident Ray Reflected Ray When the angle of incidence is greater than 42° no refraction takes place. All of the light is reflected. This is known as total internal reflection. i >42°Total Internal Reflection: Total Internal Reflection You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.