A) coloured
B) white
C) bright
D) black
Correct Answer: C
Solution :
In Youngs double slit experiment, for maximum intensity (bright fringe) \[x=m\frac{D\lambda }{d}\] where m is path difference, D the distance between screen and coherent sources, d the distance between coherent sources and K the wavelength. Putting\[m=0,\]we get the position of the central bright fringe (which is called zero order fringe). Hence, at point 0 the path difference between two wavelets is zero. Hence, at O there is always a bright fringe. This is called the central fringe.You need to login to perform this action.
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