Change of phase upon reflection: When light, traveling in a medium of index of refraction n_1, is reflected from a medium of index of refraction n_2 > n_1, a phase change of 180 degrees
The light waves reflected from a thin film of index of refraction n and thickness t, interfere destructively (i.e., no reflection takes place, the film looks dark) if
2 n t = m * lambda
Where lambda is the wavelength of the light and m = 0, 1, 2,...
Constructive interference occurs when 2 n t = (m + 1/2)*lambda.
Thin Film Interference
Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.
The book offers a complete review of your AP course, strategies to give you the edge on test day, and plenty of practice with AP-style test questions. It includes full length practice exams modeled on the real test and all the terms and concepts you need to know.
This book includes a review of all the topics tested including vectors, kinematics, fluid mechanics, optics and nuclear physics. Additionally, the book includes two full length tests made complete with descriptive solutions, and quick study tables for Physics B formulas and equations.