Reflection

Reflection

1. Rays

   • They always travel in a straight line
   • Incident rays
     • These are before the light hits the surface
   • Reflective rays
     • These are after the light hits the surface
   • The Normal
     • The normal is a line drawn at right angles to the reflector.
     • It is the same angle/distance away from the incident ray as it is from the reflective ray

2. Helpful site

   • https://www.o2learn.co.uk/o2_video.php?vid=398

3. Reflection from a plane mirror

   • The angle of incidence is equal to the angle of reflection
   • The angles are always measured from the normal

4. Plane and Diffusion reflections

   • Diffusion reactions
     • Rough surfaces scatter sound and light in all directions.
     • Each tiny bit of the surface still follows the rule that the angle of incidence equals the angle of reflection.
     • Only a little of the light from the object enters our eyes
       • This makes the object seem dull or matt
     • Example
       • Wall
   • Plane Reflections
     • This reflection is from a smooth surface
     • All the light is eflected in the same direction
       • All the light enters our eyes
         • Which makes the surface look shiny,
     • Example
       • Plain mirror

5. Diagrams

   • Draw the normal as a dotted line
     • Itis rawn 90 degrees away from the mirror
   • The light rays should be straight lines
   • Label the rays
     • Incident and reflective
   • The surface that the light bounces off
     • Plane
       • Staright line
     • Rough
       • Not a straight line