યંગના બે સ્લીટના પ્રયોગમાં \(800\,nm\) તરંગલંબાઇનો પ્રકાશ બંને સ્લીટ પર આપાત કરવામાં આવે છે. આકૃતિમાં દર્શાવ્યા પ્રમાણે \(A _1 A _2\) ને જોડતી રેખા \(A _1 P\) લંબ છે. જો બિંદુ \(P\) આગળ ન્યૂનતમ રયાય તો સ્લીટ વચ્ચેનું અંતર \(.......\,mm\) થાય.

A \(0.4\)
B \(0.5\)
C \(0.2\)
D \(0.1\)

Verified Solution

Answer & Solution

Correct Answer

(C) \(0.2\)

Step-by-step Solution

Detailed explanation

\(A _2 P - A _1 P =\frac{\lambda}{2} \quad \text { (Condition of minima) }\) \(\sqrt{ D ^2+ a ^2}- D =\frac{\lambda}{2}\) \(D \left(1+\frac{ a ^2}{ D ^2}\right)^{1 / 2}- D =\frac{\lambda}{2}\) \(D \left(1+\frac{1}{2} \times \frac{ a ^2}{ D ^2}\right)- D =\frac{\lambda}{2}\)…

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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