Physics-
General
Easy
Question
Two coherent narrow slits emitting light of wavelength 
in the same phase are placed parallel to each other at a small separation of 
. The light is collected on a screen S which is placed at a distance 
from the slit 
as shown in figure. Find the finite distance x such that the intensity of P is equal to intensity at O.
The correct answer is:
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Consider the arrangement shown in figure. By some mechanism, the separation between the slits 
and 
can be changed. The intensity is measured at the point P which is at the common perpendicular bisector of 
and 
. When 
, the intensity measured at P is I. Find this intensity when z is equal to
1) 
,
2) 
, and
3) 
.
Consider the arrangement shown in figure. By some mechanism, the separation between the slits and can be changed. The intensity is measured at the point P which is at the common perpendicular bisector of and . When , the intensity measured at P is I. Find this intensity when z is equal to
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