1. PHYS 221 Recitation Kevin Ralphs Geometric Optics

2. What is it? – Geometric optics is an approximation scheme that allows us to approximate light as rays – Applicable when the wavelength of light is very small compared to the objects and features with which it is interacting

3. Ray Diagram Terminology

4. Index of Refraction

5. Cherenkov Radiation

6. Snell’s Law

7. Mirrors & Lenses The thin lens equation and the mirror equation are identical The main challenge is observing the proper sign convention – Virtual objects and images always have negative distances There are complicated tables that tell you based on what type of mirror/lens and the relative position of the object and the focal length whether the image is upright, virtual, etc. – These are unnecessary (and sometimes confusing); A ray diagram or the use of the equations with inequalities can tell you all of this

8. Mirrors & Lenses

9. Quiz Question