Young's Double Slit Experiment (YDSE)
Category : JEE Main & Advanced
Monochromatic light (single wavelength) falls on two narrow slits \[{{S}_{1}}\] and \[{{S}_{2}}\] which are very close together acts as two coherent sources, when waves coming from two coherent sources \[({{S}_{1}},\,{{S}_{ & 2}})\] superimposes on each other, an interference pattern is obtained on the screen. In YDSE alternate bright and dark bands obtained on the screen. These bands are called Fringes.
(1) Central fringe is always bright, because at central position \[\varphi ={{0}^{o}}\]or \[\Delta =0\]
(2) The fringe pattern obtained due to a slit is more bright than that due to a point.
(3) If the slit widths are unequal, the minima will not be complete dark. For very large width uniform illumination occurs.
(4) If one slit is illuminated with red light and the other slit is illuminated with blue light, no interference pattern is observed on the screen.
(5) If the two coherent sources consist of object and it's reflected image, the central fringe is dark instead of bright one.
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