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Light Waves — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsLight Waves3 Marks
Question
If the separation between the slits in a Young's double slit experiment is increased, what happens to the fringe-width? If the separation is increased too much, will the fringe pattern remain detectable?
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Answer

The fringe width in Young's double slit experiment depends on the separation of the slits.

$\text{x}=\frac{\lambda\text{D}}{\text{d}},$

where

$\lambda$ = wavelength

x = fringe width

D = distance between slits and screen

d = separation between slits

On increasing d, fringe width decreases. If the separation is increased too much, the fringes will merge with each other and the fringe pattern won't be detectable.

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