Optics 6 Question 11
13. The angular width of the central maximum in a single slit diffraction pattern is . The width of the slit is . The slit is illuminated by monochromatic plane waves. If another slit of same width is made near it, Young’s fringes can be observed on a screen placed at a distance from the slits. If the observed fringe width is , what is slit separation distance?
(i.e. distance between the centres of each slit.)
(2018 Main)
(a)
(b)
(c)
(d)
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Solution:
- In single slit diffraction pattern,
At
In YDSE,
fringe width,