1. IB Physics Option C – Lenses & Mirrors IV Mr. Jean

2. The plan: Video clip of the day Refraction & dispersion Len & mirror videos Examples & Diagrams Convex mirror (spherical mirror)

3. Convex/converging Lens parallel rays converge to the focal point f if not parallel, they converge (image formed) at a different point at each interface, Snell’s law is satisfied

4. Where will image be formed? focus The equation: Ray diagram just like one for concave mirror, except rays continue to right instead of reflecting back! positive q = right hand side of lens Magnification same:

5. Concave/diverging Lens parallel rays seem to be coming from the focal point f

6. Diverging lenses virtual image! The equation: (negative f) Negative q: means image on same side of lens as object (virtual)

7. Thick lenses and surfaces Lens-makers’ eqn: Careful with signs!!! (see table 36.2)

8. Convex Mirror: An object is 15 cm from the surface of a reflective spherical Christmas-tree ornament 6cm in diameter. What is the position of the image?