represents a wavefront and 
and 
, the corresponding two rays. Find the condition on 
for constructive interference at 
between ray 
and reflected ray 
.
A
B
C
D
.
Text Solution
Verified by ExpertsThe correct answer is:
B
Point 
and point 
are at same phase as they are in the same phase
From figure, 
,
In 
,
Path difference,
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