AP Physics 2 / Unit 13: Geometric Optics
13.1 Reflection
Notes
Law of reflection: angle of incidence = angle of reflection, both measured from the normal.
- Smooth surfaces give specular reflection; rough surfaces give diffuse reflection.
Practice
Light hits a mirror at 30° from the normal. It reflects at:
Equal angles.
Angles in optics are measured from:
Convention.
You can't see your reflection in paper because it gives:
Rough surface scatters light.
Ready for more? Take the Unit 13 test.