1. Ray Diagrams for Plane Mirrors
LG: I can draw a ray diagram to show how an image is produced by a plane mirror

2. Ray Diagrams for Plane Mirrors
If we can find the point where two reflected rays meet, we can determine where the image will appear
For plane mirrors, reflected rays meet behind the mirror, which is where we see the image.
Concave and convex mirrors produce different kinds of images
Important Points:
Objects reflect light in all directions
We choose 2 points on the object to show what happens to the reflected light, but the same thing is happening all over the object

3. Drawing Ray Diagrams for Plane Mirrors
Draw a simple object and label one end point A and the other point B
Draw a line to represent the mirror
Draw an incident ray from point A directly to the mirror at a 90⁰ angle and draw the reflected ray back along the same line
Draw a second ray from point A at an angle toward the mirror
Draw the normal where this ray strikes the mirror
Use the law of reflection to draw the reflected ray
Use dashed lines to extend the reflected rays behind the mirror and find where they meet
Repeat steps 3-7 for point B

4. Example
Mirror

5. Practice

6. Characteristics of Images in Plane Mirrors
Examine your drawing and summarize the following characteristics of images in plane mirrors:
Image size
Image distance
Image orientation
Image type

7. Learning Check
What law must you follow in order to draw a reflected ray?
Why is it necessary to find the image of two points on the object?
Create a mind-map to link the main ideas of this unit (so far) + hand in
Law of reflection
Plane mirrors
Concave mirrors
Convex Mirrors
Wavelength
Incandescence
Light waves
Colour
Electromagnetic spectrum
Absorption
Reflection
Luminescence
White light
Opaque
Translucent
Transparent
Frequency