[Physics 2] Mirror eq, ray diagramming

• Mirror


  A highly polished surface which can produce images by the regular reflection of light
• Types of mirror


  • Plane Mirror
  • Spherical Mirror

  
• Plane Mirror


  • 2 dimensional flat
  • It produces images which are always of the same size as the objects reflected
  • Image is virtual
• Spherical/Curved Mirror


  • The mirror has a surface which is a section of a sphere (Convex mirror, concave mirror)
• Reflection from a mirror

  1. Incident ray

  2. Normal

  3. Reflected ray
• Angle of incidence


  The angle at which light hits the mirror
• Angle of reflection


  The angle at which light is reflected from the mirror
• The Law of Reflection: Angle of incidence = Angle of reflection
• Clear reflection


  Smooth, shiny surfaces
• Diffuse reflection

  Rough, dull surfaces where light is scattered in different directions
• Terminologies


  • Principal Axis (PA)
  • Vertex (V)
  • Center of Curvature (C)
  • Radius of curvature (R)
  • Principal Focus (F)
  • Focal length (f)
• Object


  Anything which reflects light
• Image


  Formed through the reflection of the light
• Definition of terms


  • Location of image
  • Orientation of the image
  • Size of the image
  • Type of the image
• Rules for Concave mirrors


  • Parallel rays of light are reflected through the principal focus F
  • Rays of light through F are reflected parallel
  • A ray of light passing through the Center of curvature C is reflected along its own path
  • The position of the top of the image is where the reflected rays meet
• The center of the sphere where the mirror was taken

  Center of Curvature (C)
• The radius of the sphere


  Radius of curvature (R)
• Midpoint between C and V

  Principal Focus (F)
• The distance between V to F


  Focal length (f)
• Anything which reflects light


  Object
• Formed through the reflection of the light


  Image
• Location of image


  Infront/at the back of the mirror
• Orientation of the image


  Upright/reversed
• Size of the image

  smaller/larger/the same
• Type of the image


  virtual/real
• Real Image is formed on the other side of the mirror.
• Virtual Image is formed behind the mirror.
• the straight line joining C and V


  Principal Axis (PA)
• The center of the mirror


  Vertex (V)