A beam of light consists of two wavelengths, 6300 
and 5600 
. This beam of light is used to obtain an interference pattern in YDSE. If 4 th bright fringe of 6300 
coincides with the n th dark fringe of 5600 
from the central line, then find the value of n.
Text Solution
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5
Fringe width 
and for 5600 
; 
So 4 th bright fringe position of 6300 
is at 
So for n th dark fringe of 5600 A is at 
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