In Young's double slit experiment, slits are separated by 
and the screen is placed at a distance of 
from the slits. Light consisting of two wavelengths 
and 
are used to obtain interference fringes. Then the separation between the fourth bright fringes of two different patterns produced by the two wavelengths is
Text Solution
Verified by ExpertsA
: Here,
Distance between the slits, 
Distance of the screen from the slits, 
Wavelengths,
and 
Distance of 
bright fringe from the centre bright fringe is
If 
and 
be the distances of the fourth bright fringes of wavelengths 
and 
respectively, then from eqn. (i)
Thus, the separation between them is
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