एक यंग द्वि-झिरी प्रयोग जिसमें झिर्रियों के बीच की दूरी \(0.1 \,mm\) है, तरंगदैर्ध्य \(\lambda_{1}\) के प्रकाश द्वारा \(\frac{1}{40}\, rad\) कोण पर दीप्त फ्रिन्ज देखी जाती है। जब इसी प्रयोग में \(\lambda_{2}\) तरंगदैर्ध्य के प्रकाश का उपयोग करते हैं तो उसी कोण पर दीप्त फ्रिन्ज देखी जाती है। दिया है कि \(\lambda_{1}\) तथा \(\lambda_{2}\) दृश्य प्रकाश के परास \((380\, nm\) से \(740\, nm\) तक) में है। तो उनके मान होंगे।

A \(625\, nm, 500\, nm\)
B \(380\, nm, 525\, nm\)
C \(380\, nm, 500\, nm\)
D \(400\, nm, 500\, nm\)

Verified Solution

Answer & Solution

Correct Answer

(A) \(625\, nm, 500\, nm\)

Step-by-step Solution

Detailed explanation

For maxima, \(\operatorname{dsin} \theta=n \lambda\) \(\lambda=\frac{\mathrm{d} \theta}{\mathrm{n}}\) ( \(\because \,\sin \theta \approx \theta \) when \(\theta\) is small ) \(=\frac{2500}{n}\, n m\) Take \(n=4,5\) for \(\lambda=625\, \mathrm{nm}\) and \(500 \,\mathrm{nm}\)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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