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यंग के द्वि रेखा –छिद्र प्रयोग मे `6600 Å` तरंगदैर्ध्य का प्रकाश पर्दे पर व्यतिकरण प्रतिरूप प्राप्त करने के लिये प्रयुक्त किया जाता है। फ्रिन्ज की चौडाई 1.5 मिमी परिवर्तित हो जाती है। जब पर्दो 50 सेमी द्विक रेखा – छिद्र की ओर लाया जाता है दोनो द्विक रेखा – छिद्रों के बीच दूरी ज्ञात कीजिए।

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‌फ्रिन्ज की चौडाई `W= (D lambda)/(d)`
`:. Delta W = (Delta Dlambda)/(d)`
अथवा `d = (Delta D lambda)/(Delta W) =(50 xx 10^(-2)) xx (6600 xx 10^(-10))/(1.5 xx 10^(-3))`
` =0.22 xx 10^(-3)` मी .0.22 मिमी।

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