2009/12/08 Class Content

1. This year will some be at an e[]nd.
2. A new year will some be coming.
3. In the wake of(緊隨在...之後) Dubai's debt crisis, analysts are trying to predict the next big blow up.
4. least time principle
5. Mininum energy principle
6. gradient, 梯度

Homework #9

證明Snell's Law
If V₁ > V₂
than θ₁ > θ₂