Evans SPH 3U1
Physics Grade 11
Unit 3: Light and Optics
Note 2: Reflection and Plane Mirrors
Reference: Chapter 10.4
Terminology:
Wavefronts and Wave Rays
Normal - reference line perpendicular to a surface
Incident Ray and Reflected Ray
Reflection:
- angle of incidence is equal to the angle of reflection.. Angles are drawn between the normal and incident or reflected ray.
Images:
Real Image - can be captured on a screen (i.e. pinhole camera)
Virtual Image - cannot be captured on a screen (i.e. mirrors)
Drawing Ray Diagrams for a Plane Mirror:
1) Draw a reference line (normal) half way between the object and the viewing eye
2) Draw at least two light rays to get a reasonable image
i) and ii)
3) Extend the rays behind the mirror.
For plane mirror reflections
- the image appears behind the mirror.
- the image is reversed (lateral inversion) but right side up
- the same size as the object
Complete 14-2 Handout
Review Questions page 345 # 4, 6, 16, 19, 25ac, 29, 33, 38, 40
Quiz