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7.27 - TIE—Planar TWaxes in a Slit Experiment 3 A...

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Unformatted text preview: TIE—Planar TWaxes in a Slit Experiment - 3 A planarwaxe is ineident an a single slit and farms a diffiaetian pattern an a sereen. The pattern has a eentral, sereflkarder maximum and a number af see IZIflIIlEI'jF maxima. The first-arder maximum is farmed in a direetian Where light fiam the tap third {a} af the slit eaneels light fiam the middle third {h}. The intensity af the first-arder maximum is thus due :3an tn the hattam third af the light thraugh the slit {e} and is therefare raughljr 1i“? af the intensity I sf the eentral maximum. TWhat is the intensity af the seeand-arder maximum? .Inmnul h'l'mtruatd'llm' fl. 1— smite-add: ,r-r‘” '3! JI'H IIIII e --" I“! -"|" r' a fin: s-‘eur _..-- x- a. .' II F. .-" {’th __':| " .3 _-r EFF EH_;FII‘T-J {if 4— minder __,,. "- :I.'1 "-— ____ I-I-IIHE .14'25 Answer: 4. The seeand-arder maximum is farmedwhen light fiam the tap fifth eaneels the seeand fifth af the light passing thraugh the slit, as daes light farm the third and fauith fifth. The seeand-arder maximum is thus due tn the hattam fifth af the light passing thraugh the slit. Eeeause the intensity af light is prepartianal tn the square ef the eleetrie field, the intensity af the seeand-arder maximum is raughljr I i“ 25 af the ineident intensity. ...
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