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यंग के द्व‌ि- स्लिट प्रयोग में पर्दे पर पहुँचने वाली तरंगें का पथान्तर `lambda//6` है। इस बिन्दु पर तीव्रता I तथा अधिकतम तीव्रता `I_(o)` का अनुपात ज्ञात कीजिए।

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`I = I_(0) cos^(2) .((pi)/(lambda ) xx Deltax)`
`= I_(0) cos^(2) ((pi)/(lambda) xx (lambda)/(6)) =I_(0) cos^(2) .(pi)/(6)`
`:. (I)/(I_(0)) =(3)/(4)`

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