3. Reflection.pptx

REFLECTION Reflection occurs when a light ray bounces off an object PART 2 - REFLECTION  Reflection from a mirror: Normal Incident ray Reflected ray Angle of incidence Angle of...

REFLECTION Reflection occurs when a light ray bounces off an object PART 2 - REFLECTION  Reflection from a mirror: Normal Incident ray Reflected ray Angle of incidence Angle of reflection Mirror   The Law of Reflection Angle of incidence = Angle of reflection In other words, light gets reflected from a surface at ____ _____ angle it hits it. The same !!!  CLEAR VS. DIFFUSE REFLECTION  Smooth, shiny surfaces have a clear reflection (forming sharp and clear images.  Rough, dull surfaces have a diffuse reflection  Diffuse reflection is when light is scattered in different directions. This means a clear image cannot be formed.  A plane mirror is a mirror with a flat reflective surface.  Like the mirror that you look into at home/in the bathroom.  These mirrors produce a virtual image. PLANE MIRRORS  A real image is defined as a image that has light rays passing though it.  A virtual image does not have light rays passing through it. Example: When you look at yourself in the mirror, the image appears to be there, however it is inverted (laterally). REAL VS. VIRTUAL IMAGES  1 2 5 3 6 4  2 5 3 6 4  5 3 6 4  5 6 4 5 6 6  Reflection can be very useful.  High-visibility strips are very reflective and make sure that this cyclist gets noticed when there is little light. How does a periscope use reflection?  The two plane mirrors must be positioned at 45° to each other.  Light is reflected at right angles from the top mirror onto the bottom mirror and into the eye of the viewer. USING REFLECTION  PHET simulation  https://phet.colorado.edu/sims/html/bending-light/latest/bendi ng-light_en.html  Activity sheet provided INVESTIGATING REFLECTION  Stile: 5.1 - Reflection ACTIVITY