In the diagram below, 
represents a wavefront and 
and 
, the corresponding incident rays. Find the condition of 
for constructive interference at point 
between the rays 
and reflected ray 
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Path difference between the two rays is given by
Phase difference between two rays is 
(as one ray is reflected one and another is direct).
Now, for constructive interference, path difference should be even multiple of half-wavelength.
i.e. 
So, 
or 
Or 
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