1. 4.4 Images in a Plane Mirror

2. Images in Plane Mirrors When you place an object in front of a mirror the light rays reflect off the object and some will reflect off of the mirror –This is according to the Law of Reflection

3. Images in Plane Mirrors This fools our brain because the brain “knows” that light travels in a straight line so your brain thinks the object is behind the mirror.

4. Ray Diagrams for Plane Mirrors Two rays reflecting from the mirror are needed to find the point where the reflection of an object is located –Object – the item in front of the mirror –Image – the reflection of the object in the mirror –Object distance – the distance from the object to the mirror –Image distance – the distance from the mirror to the image

5. Ray Diagrams for Plane Mirrors Because the image does not exist behind the mirror and only in our brains it is called a virtual image –Virtual images exist only when rays must be drawn backward to find where they meet.

6. Drawing Ray diagrams To draw the image of an object you need the location of at least 2 points on the object.

7. A B A1

8. A B B1

9. A1 B1 A B

10. A1 B1 A B