Q. The fringe width in Young’s experiment is proportional to

यंग के प्रयोग में फ्रिंज की चौड़ाई समानुपाती होती है

1/λ

D/λ
डी/λ

λ/D
λ/डी

λd/D
λडी/डी

Fringe width β in Young’s double-slit experiment is given by:

\beta = \frac{\lambda D}{d}

So, it is directly proportional to wavelength (λ) and distance from slits to screen (D), and inversely proportional to slit separation (d).

None of your options exactly match, but likely the intended correct one is:

λd/D ⛔ → Incorrect
λD/d ✅ → Correct form

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