This preview shows page 1. Sign up to view the full content.
Unformatted text preview: Constructive: same freq, constant phase relationship, r 2- 1 = , amplitudes add Destructive: amplitudes subtract, r 2- 1 = ( + 1 2 29 2 slit interference: Constructive: d sin = Destructive: d sin = ( + 1 2 29 Distance from center to m th brightest: y m = (small angles only) Amplitude of 2 waves: E p = 2 2 Intensity: I = 2 2 = 2 ( 2 29 Max Intensity: I = 2 2 (4x ind I) Given Direction: I = 2 ( 29 Phase difference: k is wave # = 2 p l ( r 2- r 1 ) = k ( r 2- r 1 ) = n k = Thin Films: Amplitude of reflected wave E r = - + If n a >n b : light travels faster in 2 nd material, E r and E i have the same sign, phase shift = 0 If n a =n b : no reflected wave (E r = 0) If n a <n b : light travels faster in 1 st material, E r and E i have opposite signs, phase shift = Interference (t=thickness) If no phase shift: constructive occurs @...
View Full Document
This note was uploaded on 01/23/2009 for the course PHYSICS 240 taught by Professor Davewinn during the Spring '08 term at University of Michigan.
- Spring '08