Figure shows two, identical narrow slits 
and 
. A very small completely absorbing strip is placed at distance ' 
' from the point 
. ' 
' is the point on the screen equidistant from 
and 
. Assume 
, where 
, 
and 
have usual meaning. When 
is covered the force due to light acting on strip is ' 
' and when both slits are opened the force acting on strip is 
. The minimum positive ' 
' 
coordinate is 
. Find the value of 
.
Text Solution
Verified by Experts4
(4) Let 
be the intensity at 
due to individual slits 
or 
. When waves due to both the sources superpose at 
, the net intensity at 
is
where 
Since force on strip at 
is twice due to individual source Hence, 
.
or 
or 
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