1. PAP Physics Review Ch 14 – Light and Reflection
Electromagnetic waves
All travel at the same speed in a vacuum (c=f); as f↑ ↓
Know colors in order of increasing frequency (decreasing wavelength)
Brightness decreases by the inverse square law
Law of reflection i=r
Mirrors
Flat mirrors produce virtual, upright, unmagnified images (left-right reversed)
Convex (diverging) mirrors produce virtual, upright, smaller images; convex mirrors have negative f
Concave (converging) mirrors
Beyond C – real, inverted, smaller
Between C and f – real, inverted, larger
In front of f – virtual, upright, larger
Real images (di is +) are inverted (M is -); virtual (di is -) are upright (M is +)
Draw ray diagrams – ray parallel to principal axis reflects through f; ray through f reflects parallel; ray through C reflects back upon itself
Use mirror and magnification equations
Parabolic mirrors eliminate spherical aberration
Know what determines color of an object; three primary additive colors; three primary subtractive colors; why the sky is blue; why sunsets are red
Linear polarization of light verifies light is a transverse wave; no light passes through when films are at right angles