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Unformatted text preview: OUT 1 ) when the optical path lengths of the two paths dier by an integer, N opt = 0 , 1 , 2 ,... , and we have destructive interference (low intensity in OUT 1 ) when they dier by an integer plus half, N opt = 1 2 , 3 2 , 5 2 ,... . Changing from =90 to = 90 gives N opt =90 =90 = 2 A V , which tell us that 1.5 ] of cycles = 2 A V . Experimental data For a = 3 . 6 cm and = 22 . 1 we have A = 10 . 53 cm 2 , so that 1.6 = 19 . 1597 2 10 . 53 nm = 0 . 1441 nm . And 30 full cycles for = 0 . 2 nm correspond to an area 1.7 A = 30 . 1597 2 . 2 cm 2 = 11 . 98 cm 2 . 2...
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 Spring '11
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