Full set of Notes with Fill-Ins - San Jose State University

Chem 155 Unit 12 219 of 316How is interferometry performed?Recall – light interference is how gratings work.cos( θ ) 6cos( θ ) 4cos( θ ) cos( θ )cos( θ ) 6cos( θ π ) 4cos( θ ) cos( θ π )105050 0.5 1 1.5 2 2.5 3θ2 . π1050Light ElectricFields SumConstructiveInterferenceDestructiveInterference50 0.5 1 1.5 2 2.5 3θ2 πConstructive interference:nλ = f( sin(i)+sin(r) ) for a gratingFor gratings constructiveinterference occurs when the pathlength difference between the rays,δ, is an integral multiple of thewavelength, λ:δ = d(sin(I)+sin(r)) = nλnλ = f( time) for an interferometerPage 219 of 316