Curved Mirrors (Two Kinds) C: Centre of Curvature (2F) V: Vertex PA: Principal Axis F: Focal Point f : focal length (Distance FV)

1. Concave Mirrors If the curvature is inward (“like a cave”), it is called “concave”. This is like having the inside of a hollow sphere as a mirror. Also called “converging mirrors” because light converges (towards) on the focal point

CONVERGING (CONCAVE) MIRROR Ray # Incident RayReflected RayDiagram 1Parallel to Principal Axis (PA) Through the Focal Point (F) 2 Parallel to Principal Axis (PA) 3Through the Centre of Curvature (C) V CF PA V CF V CF

1. Locate the image in a Concave Mirror when the object before C. V CF PA Describe the Image (SALT) S: Smaller, Same Size or Larger A: Inverted or Upright L: Behind or In-front of mirror T: Real or Virtual or No Image object image

2. Locate the image in a Concave Mirror when the object is at C V CF PA Describe the Image (SALT) S: Smaller, Same Size or Larger A: Inverted or Upright L: Behind or In-front of mirror T: Real or Virtual or No Image object image

3. Locate the image in a Concave Mirror when the object is between C and F V CF PA Describe the Image (SALT) S: Smaller, Same Size or Larger A: Inverted or Upright L: Behind or In-front of mirror T: Real or Virtual or No Image image object

4. Locate the image in a Concave Mirror when the object is at F V CF PA Describe the Image (SALT) S: Smaller, Same Size or Larger A: Inverted or Upright L: Behind or In-front of mirror T: Real or Virtual or No Image object NO Image!!! (Parallel Lines)

5. Locate the image in a Concave Mirror when the object is between F and V V CF PA Describe the Image (SALT) S: Smaller, Same Size or Larger A: Inverted or Upright L: Behind or In-front of mirror T: Real or Virtual or No Image object Image Behind mirror

2. Convex mirrors If the curvature is outward, it is called “convex”. Central Tech and many stores have these mirrors for safety – Also known as “diverging” mirrors – light goes away (diverges) from the focal point.

DIVERGING (CONVEX) MIRROR Ray #Incident RayReflected RayDiagram 1Parallel to Principal Axis (PA) Away from the Focal Point (F) 2Towards the Focal Point (F) Parallel to Principal Axis (PA) 3Through the Centre of Curvature (C) V C F PA V C F V C F

1. Locate the image in a Convex Mirror when the object is in front of the Mirror V C F PA Describe the Image (SALT) S: Smaller, Same Size or Larger A: Inverted or Upright L: Behind or In-front of mirror T: Real or Virtual or No Image object image