1. AP Physics Chp 25

2. Wavefronts – location of the same point for the same phase of the wave Rays – perpendicular to the wavefront Plane waves – all rays are parallel

4. Reflection Specular vs Diffuse Law of Reflection θi = θr

5. Plane Mirrors (flat) Image Upright Same Size Behind the mirror (virtual)

7. How big does a wall mirror really have to be to be “full length”?

9. Spherical Mirrors Concave vs Convex Principal Axis – line through the C, center of curvature

11. Focal length f = ½ R concave f = - ½ R convex If the rays are close to the axis then they are called paraxial rays Spherical aberration Parabolic mirrors – all rays that are parallel to axis reflect through the focal point

13. Ray diagrams 1 – tip of object to mirror and then through f 2 – tip of object through f then parallel to axis 3 – tip through C (1 line) Intersection is the image location

15. Sign conventions f, d + is in front of the mirror - is behind the mirror Sometimes using multiple mirrors can cause the object distance to be - h + is upright - is inverted

16. Mirror Equation

17. Magnification Equation A negative m means it’s inverted

18. If an object is located 3 m in front of a concave mirror that has a radius of 1 m, where is the image and what is it’s magnification?