તરંગલંબાઈ \(6000\)A નો એકરંગી પ્રકાશ \(0.01 \mathrm{~mm}\) પહોળાઈની એકલ સ્લિટ પર આપાત થાય છે. જો વિવર્તન પેટર્ન \(20 \mathrm{~cm}\) કેન્દ્રલંબાઈવાળા બહિર્ગોળ લેન્સના કેન્દ્ર પર રચાય, તો કેન્દ્રીય મહત્તમની રેખીય પહોળાઈ _______ છે.

A \(60 \mathrm{~mm}\)
B \(24 \mathrm{~mm}\)
C \(120 \mathrm{~mm}\)
D \(12 \mathrm{~mm}\)

Verified Solution

Answer & Solution

Correct Answer

(B) \(24 \mathrm{~mm}\)

Step-by-step Solution

Detailed explanation

રેખીય પહોળાઈ \(\mathrm{W} =\frac{2 \lambda \mathrm{d}}{\mathrm{a}}=\frac{2 \times 6 \times 10^{-7} \times 0.2}{1 \times 10^{-5}}\) \(=2.4 \times 10^{-2}=24 \mathrm{~mm}\)

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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