Two
slits of width a and separation d are illuminated by a coherent beam
of light of wavelength
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Solution: Click For PDF Version Let us consider a Young’s double-slit of slit separation d. The condition for interference maxima of a Young’s double-slit is
Assuming that
the distance of the screen from the slits
where y is the distance of a fringe from the central fringe.
We thus note the linear difference between successive fringes will be given as
In the above analysis we have considered fringes that are contained within a diffraction lobe.
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We have to find the linear separation of the
interference fringes observed on a screen that is a distance D away.
,
we approximate
