This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: OUT 1 ) when the optical path lengths of the two paths diﬀer by an integer, Δ N opt = 0 , ± 1 , ± 2 ,... , and we have destructive interference (low intensity in OUT 1 ) when they diﬀer by an integer plus half, Δ N opt = ± 1 2 , ± 3 2 , ± 5 2 ,... . Changing φ from φ =90 ◦ to φ = 90 ◦ gives Δ N opt ± ± ± ± φ =90 ◦ φ =90 ◦ = 2 λ A V , which tell us that 1.5 ] of cycles = 2 λ A V . Experimental data For a = 3 . 6 cm and θ = 22 . 1 ◦ we have A = 10 . 53 cm 2 , so that 1.6 λ = 19 × . 1597 2 × 10 . 53 nm = 0 . 1441 nm . And 30 full cycles for λ = 0 . 2 nm correspond to an area 1.7 A = 30 × . 1597 2 × . 2 cm 2 = 11 . 98 cm 2 . 2...
View
Full Document
 Spring '11
 NA
 Diffraction, Wavelength, Sin

Click to edit the document details