Friday, April 27, 2007

I TA for this student:

On 4/26/07, < > wrote:
It seems you have not turned in your lab report on xrd(lab no. 3)

This is true. The reason for not having it turned in is that it was not written. Thank you for the notification, but do not expect to see it unless I hear back from you requesting otherwise.
- Allen

Friday, April 20, 2007

Fermat's principle:

Light follows a path which minimizes the total travel time.

Law of reflection, and law of refraction are a direct fall-out of this!

Courtesy: Applications of Calculus, Philip Straffin

P.S: They chose not to copyright this book! ^:)^