1. Interference: Mathematically Example Problem What type of interference occurs at points P, Q,
and R? Point Ar as GAE
Solution
To measure r 1 for point P. just count the number of path carried between as a multiple of
wavelength.
Now, distance between source 1 and point P is 2*lambda
distance between source 1 and point Q is 3*lambda
distance between source 1 and R is 2.3*lambda
Similarly,
distance between source 2 and point p is 3*lambda
distance between source 2 and point Q is 1.2*lamda
distance between source 2 and point R is 3*lambda
Therefore, type of interference
At P , Destructive
At Q , Constructive
At R, Constructive